Garuda - Garba Rujukan Digital

ANALISIS KESALAHAN SISWA DALAM MENYELESAIKAN SOAL KESEBANGUNAN BERDASARKAN PROSEDUR NEWMAN DITINJAU DARI KEMAMPUAN SPASIAL (Penelitian dilaksanakan di Kelas IX SMPN 1 Paguyangan Kabupaten Brebes) Widodo, An Nur Ami; Sujadi, Imam; Mardiyana, Mardiyana
Journal of Mathematics and Mathematics Education Vol 7, No 1 (2017): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (261.972 KB)

Abstract : The aim of this research was to identify the types of students error at 9th grade of SMPN 1 Paguyangan in solving similarity by using Newmanâs error analysis procedure from spatial ability. The type of this research is a qualitative research. Subjectâs selection procedure was by using purposive sampling. There are 6 subjects in this research. Data collection technique was task-based interviews. The validity was determined by time triangulation. The data analysis was Miles and Huberman model including reduction, data displays, and conclusion. The results of this research showed as follows. The types students with low spatial ability error in solving based on Newmanâs error analysis procedure were: reading error, comprehension error, transformation error, process skill error, and encoding errors. The types students with medium spatial ability error in solving based on Newmanâs error analysis procedure were: transformation error, process skill error, and encoding error. The types students with high spatial ability error in solving based on Newmanâs error analysis procedure were : transformation error.Keywords: types of error, Newman procedure, spatial ability.

PROSES BERPIKIR MAHASISWA PENDIDIKAN MATEMATIKA DALAM PEMECAHAN MASALAH PEMBUKTIAN TAHUN AKADEMIK 2014/2015 Yohanie, Dian Devita; Sujadi, Imam; Usodo, Budi
Journal of Mathematics and Mathematics Education Vol 6, No 1 (2016): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (351.975 KB)

Abstract: This research aimed to describe the thinking process in proof problem solving using direct, contraposition, and contradiction methods in 2nd semester mathematic education students of Nusantara PGRI University of Kediri with (1) high, (2) moderate, and (3) low learning achievements. The research method employed was qualitative approach. Subject of research was selected using purposive sampling technique, consisting of 6 2nd-semester mathematic education students: 2 students with high, 2 with moderate, and 2 with low learning achievements. Data collection was carried out using interview based on proof problem solving assignment. Data validation was carried out using time triangulation, and the valid data was analyzed using data reduction, data display, and conclusion drawing.Â The result of research showed that: (1) The thinking process of students with high learning achievement. The proof problem solving in direct contraposition, and contradiction ways. In entry phase, the subjects understood the problem by writing antecedent as they know and consequence to be proved. In finishing phase, the subjects explained antecedent into premise correctly and completely, did algebraic operation to connect consequence to premise, in order to prove the consequence. In review phase, the subjects check their answer and were sure with their answer after seeing the process and proof result. (2) The thinking process of students with moderate learning achievement. The proof problem solving in direct, contraposition, and contradiction ways. In entry phase, the subjects understood the problem by writing antecedent as they know and consequence to be proved. In finishing phase, the subjects explained antecedent into premise correctly, did algebraic operation with summing procedure and distributive property to connect consequence to premise in order to prove the consequence. In review phase, the subjects did not check their answer and were sure with their answer when theirÂ proved. (3) The thinking process of students with low learning achievement. The proof problem solving in direct, contraposition, and contradiction ways. In entry phase is the same, the subjects understood the problem by writing antecedent as they know and consequence to be proved. In finishing phase, the subjects explained antecedent into premise difficultly, did algebraic operation with summing procedure and distributive property to connect consequence to premise using number example, thereby could not prove the consequence. Then in review phase, the subjects did not check their answer and were sure with their answer after seeing their proof result.Keywords: Thinking Process, Problem Solving, Proof, Learning AchievementÂ

EKSPERIMENTASI MODEL PEMBELAJARAN KOOPERATIF TIPE TEAM ASSISTED INDIVIDUALIZATION (TAI) DAN TEAMS GAMES TOURNAMENT (TGT) PADA MATERI PERSAMAAN DAN PERTIDAKSAMAAN DITINJAU DARI GAYA BELAJAR SISWA KELAS X SMK SE-KABUPATEN NGAWI TAHUN PELAJARAN 2015/2016 Nirawati, Lia Septy; Kusmayadi, Tri Atmojo; Sujadi, Imam
Journal of Mathematics and Mathematics Education Vol 7, No 1 (2017): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (345.054 KB)

Abstract: The purpose of this study was to know the effect of the learning models on the learning achievement in mathematics viewed from the students adversity quotient. The learning models compared were the cooperative learning of TAI, TGT, and direct learning model. The type of research was a Â quasi-experimental research with aÂ 3x3 factorial design. The study population was all grade 10 students of Secondary Schools in Ngawi Regency in the academic year of 2015/2016. Instruments used for data collection were mathematics achievement test and learning style questionnaire. The data analysis technique used was the two-way ANOVA with unequal cell. Based on the hypothesis test, it was concluded that: 1) The mathematics learning achievement of the students who were treated by TAI learning model was better than the mathematics learning achievement of the students who were treated by TGT and direct learning model on equality and inequality, the mathematics learning achievement of the students who were treated by TGT learning model was better than the mathematics learning achievement of the students who were treated by direct learning model on equality an inequality; 2) The mathematics learning achievement of the students with visual type was better than the mathematics learning achievement of the students with auditory or kinesthetic type and the learning achievement of auditory type students was better than Â the Â learning Â achievement of kinesthetic type students on equality and inequality; 3) The visual type students who were treated by TAI learning model had better mathematics learning achievement than the students with TGT or direct learning model and the students mathematics learning learningÂ achievement with TGT learning model was same the students with direct learning model; the mathematics achievement of auditory type students who were treated by TAI learning model had better mathematics learning achievement than the students with TGT or direct learning model and students who were treated by TGT learning model had better mathematics learning achievement than the students with direct learning model; the mathematics achievement of kinesthetic type students who were treated by TAI, TGT, and direct learning models had the same mathematics learning achievement; 4) In TAI, TGT and direct learning model, the mathematics learning achievement of visual type, auditory, and kinesthetic had the same mathematics learning achievement.Keywords: TAI, TGT, Direct Learning Model, Learning Style, Mathematics Learning Achievement

ANALISIS PROSES PEMBELAJARAN MATEMATIKA DI SMK RSBI SURAKARTA Puspitasari, Norma; Sujadi, Imam; Soeyono, Soeyono
Journal of Mathematics and Mathematics Education Vol 2, No 1 (2012): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.976 KB)

AbstractÂ This study aims :1)to describe process of learning mathematics in vocational RSBI Surakarta.2) to know whether the process of learning mathematics in vocational RSBI Surakarta whether it is in accordance with quality assurance system RSBI.This study used a qualitative approach. The subject of this study was a mathematics teacher in class XI program of tourism expertise. The data was taken by RPP and learning activities in the transformation geometry subject. Instruments used observation and interview guide sheet. Techniques of data collection by interview, observation and documentation. The validity of the data used the triangulationÂ methods and data sources. Data analysis techniques included data reduction, data presentation and conclusions.These results indicated that: 1) The process of learning mathematics at SMK Negeri 6 Surakarta were as follows (a) The planning was not appropriateÂ with the standards process because there are some errors in the writing of the identity,Â programming skills are not included the amount of meetings and the planning has not been madeÂ (b) The implementation ofÂ mathematics learningÂ in the transformation geometry subject in early learning activities, the teacher of grade XI mathematics SMK Negeri 6 Surakarta apperception conducted a glimpse for repeating previous material. The main activities of learning, classroom math teacher of SMK Negeri 6 Surakarta XI UPW has implemented major exploration by encouraging students to do the experiment in determining the reflection point and the point of rotation with Geogebra software media, teachers conducted elaboration by discussion and taking conclusion after demonstration done without giving opportunities for students to analyzit. The teacher conducted confirmation by giving positive feedback and reinforcement in verbal to the success of students, gave the confirmation to the result of exploration and elaboration and got correction to the student mistakes. (c) The use of information technology-based media on the powerpoint application program, animation or presentation media in the mathematics learning process was optimally supported by Geogebra media software as supported transformation geometry media. (d) Use the usual methods of teaching applied mathematics teacher SMK Negeri 6 Surakarta was demonstration because it considered suitable for the material submitted with the help of the above media. (e) The use of English in learning mathematics restricted for the opening only, the slides that used in the learning was also not in English. (F) In the end of the lesson the teacher give students chance to ask which part of the material that still not understand, Taking conclusion from the material together with the students, giving exercises, and post test. (g) In the assessment step, grade XI mathematics teacher of SMK Negeri 6 Surakarta correcting students test results, give feedbacks and comments, restore the work to the students.The results of the research also showed that; 2) The process of mathematics learning at SMK Negeri 6 Surakarta if it has been related with quality assurance system are (a) The process of mathematics learning is good but not meet the standards process and has not been riched by learning process from one of developed OECD country or other developing country. (b) The process of learning in mathematic have developing a noble character, manners, noble, excellent personality, leadership, life enterpreneural, patriot and soul. (c) The use of English in mathematics teaching was too minimal only at the opening, the delivering materials also have not to use English. (d) The use of ICT have good proved by the learning process using the LCD and Geogebra software.Keywords: Mathematics Learning Process, Vocational RSBI,Â Quality AssuranceÂ System

KEMAMPUAN KOMUNIKASI MATEMATIS SISWA KELAS VII SMP NEGERI 1 MOJOLABAN TAHUN PELAJARAN 2014/2015 Khoiriyah, Nor; Sujadi, Imam; Subanti, Sri
Journal of Mathematics and Mathematics Education Vol 6, No 1 (2016): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.534 KB)

Abstract. The purpose of this research was to describe the ability of studentâs mathematical communication who had low, medium, and high early mathematics ability in class VII SMP Negeri 1 Mojolaban on aspect grammatical, sociolinguistic, strategic, and discourse competence in solving mathematics problem. This research was a qualitative research. The subjects in this research were seven students of class VIIE SMP Negeri 1 Mojolaban, which consisted of three students who had low early mathematical ability, two students who had medium early mathematics ability, and two students who hadÂ high early mathematical ability.The subjects in this research were taken by using the purposive sampling technique. The main instrument used in this research to collect the data was the researcher and the other instrument were a task that contains of test question and interview guide instrument. Data analysis technique were conducted by data reduction, data presentation and conclusion. The validity of the data was conducted by using time triangulation that compared the data of the first task based interviews with the data of the second task based interviews. The equal valid data of mathematical communication ability on aspect grammatical, sociolinguistic, strategic, and discourse competence was made the main finding, whereas the different of valid data was made other finding of the research. The result of this research are the students who had low, medium, and high early mathematics abilities were have imperfect mathematical communication on grammatical, sociolinguistic, strategic, and discourse competence. The imperfection that appearÂ on each competence caused by some indicators that not fulfilled completely.Keywords: Mathematical communication, grammatical competence, discourse competence

PROSES MEMBANGUN PENGETAHUAN KONSEPTUAL PADA SISWA KELAS VIII DALAM PEMBELAJARAN MATEMATIKA DI SMP NEGERI 1 KUDUS Arisjanti, Nova Ayu; Sujadi, Imam; Kusmayadi, Tri Atmojo
Journal of Mathematics and Mathematics Education Vol 4, No 1 (2014): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (270.991 KB)

Abstract: The objective of this research is to describe the process of conceptual knowledge building of the students in Grade VIII in Mathematics learning at State Junior High School 1 of Kudus. This research used a qualitative case study method. The subjects of the research were three students in Grade VIII of the school with the high, medium, and low academic abilities respectively. The subjects of the research were chosen by using the purposive sampling technique. The data of the research were gathered through passive participatory observations. All of the learning activities were documented by taping them with handy camera. Based on data analysis of the three students in Grade VIII with the high, medium, and low academic abilities respectively in mathematics learning at the cube and cuboid elements at State Junior High School 1 of Kudus are as follows. (1) The process of conceptual knowledge building of the subject of the research with the low academic ability. Initially the knowledge associated with submitted materials teachers are still global. The information and knowledge obtained from doing the exercises, through: (a) visualizing the shape of cube and cuboid into the other shape to identify the elements; (b) making the relation and category classification between cube and cuboid. Doing the other activity, like: (a) learning the note book, handbook, and studentâs work sheet; (b) using the complete note book as reference in the learning; (c) attending courses. (2) The process of conceptual knowledge building of the subject of the research with the medium academic ability. Initially knowledge obtained from teacher in the mathematics learning still global. The information and knowledge obtained from doing the exercises, through: (a) making the relation and category classification between cube and cuboid; (b) identifying the side of shape from cuboid through example. Doing the other activity, like: (a) relearning the material; (b) using material from explanation the teacher as reference in the learning; (c) giving certain signs if there are differences in the contents of the learning materials of the books learned; (d) doing the different exercises with example from the teacher; (e) attending courses. (3) The process of conceptual knowledge building of the subject of the research with the high academic ability. Initially acquired knowledge not as detailed as what the teachers explained. The information and knowledge obtained from doing the exercises, through: (a) discussion; (b) visualizing the shape of cube and cuboid into the other shape to indentify the elements; (c) determining criteria of classification the cube and cuboid. Doing the other activity, like: (a) reading the material; (b) doing the exercises from the formula and solution in the handbook; (c) attending courses.Keywords: the process of knowledge building, conceptual knowledge, and mathematics learning.

PROSES BERPIKIR SISWA KELAS VII SMP NEGERI 2 SEMEN KEDIRI BERDASARKAN TAHAP PROSES BERPIKIR SOLSO DALAM MEMECAHKAN MASALAH MATEMATIKA DITINJAU DARI ADVERSITY QUOTIENT (AQ) Hanafiah, Anis; Riyadi, Riyadi; Sujadi, Imam
Journal of Mathematics and Mathematics Education Vol 6, No 2 (2016): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (358.189 KB)

Abstract: The purposes of the research were to describe (1) Thinking process of climber students grade VII SMPN 2 Semen in problem solving of mathematics. (2) Thinking process of camper students grade VII SMPN 2 Semen in problem solving of mathematics (3) Thinking process of quitter students grade VII SMPN 2 Semen in problem solving of mathematics. The thinking process in this research uses steps of Solso thinking, forming concept, logically, and taking decision. This research is qualitative descriptive research. The subjects in this research are taken by purposive sampling. The subjects of this research are 3 students from grade VII SMPN 2 Semen, they are 1 student of climber type, 1 student of campers type, and 1 student of quitters type. The data collection of this research uses polling and questionaire technic based on duties that is done for comparison material. The legality of data used in this research is triangulation time and using reference sufficience. The technic of data analysis used is Miles and Huberman concept, these are data reduction, giving data and getting conclution. The results of this research show that (1) the thinking process of climber students, in problem solving of mathematics on steps: (a) understanding the problem that have done: (i) forming concept, (ii) thinking logically, (iii) taking decision; (b) arranging the plan for problem solving by: (i) forming concept, (ii) thinking logically, (iii) taking decision. (c) doing the plan of problem solving by: (i) forming concept, (ii) thinking logically, (iii) taking decision. (d) recheck the result by: (i) forming concept, (ii) thinking logically, (iii) taking decision; (2) The thinking process of camper students in problem solving of mathematics on steps: (a) understanding the problem by: (i) forming concept, (ii) thinking logically, (iii) taking decision. (b) arranging the plan for problem solving by: (i) forming concept, (ii) thinking logically, (iii) not taking decision. (c) doing the plan for problem solving, by (i) forming concept, (ii) thinking logically, (iii) taking decision. (d) recheck the result by: (i) forming concept, (ii) thinking logically, (iii) not taking decision. (3) The thinking process of quitter students in problem solving of mathematics on steps: (a) understanding the problem by, (i) forming concept, (ii) not thinking logically, (iii) canât take decision. (b) planning for problem soving: (i) not forming concept, (ii) thinking logically, (iii) canât take decision, (c) canât run for the probem solving. (d) not rechecking the problem solving.Keywords: thinking process, problem solving, Adversity Quotient (AQ)

PROSES BERPIKIR SISWA TUNAGRAHITA RINGAN DALAM MEMECAHKAN MASALAH MATEMATIKA BENTUK SOAL CERITA PADA OPERASI HITUNG CAMPURAN Hidayah, Muhlishotul; Sujadi, Imam; Pangadi, Pangadi
Journal of Mathematics and Mathematics Education Vol 4, No 1 (2014): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (270.226 KB)

Abstract: The aim of this research was to describe the thinking process of students with mild mental retardation in solving mathematics problems concerning with story questions in a mixed arithmetic operation. This research was a qualitative case study. The subjects of this research were the students of VIII C SLB Negeri Surakarta consisting of two students: a male and a female students. The procedure of selecting the subject used purposive sampling. The data of the research were collected by using think aloud method. To validate the data, the researcher used time triangulation. The techniques of analyzing the data were: (1) classifying the data into four categories based on Santrock steps: (a) finding and framing the problem, (b) developing problem-solving strategies, (c) evaluating solutions, and (d) rethinking and redefining the problem and solutions, and then reducing the data that are not included in four categories, (2) presenting the data in table, and (3) concluding thinking process of students with mild mental retardation in each category. The results of the research showed that: (a) finding and framing the problem: The two students began the activities by reading the questions, then the students kept silent while reexamining the questions, the students could not mention what was known and what was asked, the students waited for the instruction about what to do, the students could only reveal some information on what was known. To find out the information asked, the one of students got difficulty in mentioning what was asked shown by silent respond then read the questions again, and another student reexamined the questions and revealed the answers related to arithmetic operations. In framing the problem-solving strategy, these two students needed guidance to make strategy by linking the arithmetic operations, and another student also expresses problem-solving strategies that were not appropriate on the first step, (b) developing problem-solving strategies: these two students needed guidance in solving problems, another student solved problems based on the strategy that had been compiled by linking the arithmetic operations, while another student got difficulties when implementing different strategies. In the process of calculating, the students completed the calculation by compiling it downwards, and the students tended to use their hands as a means of calculation, (c) evaluating solutions: the student checked the answer by recalculating the answer, while another student only looked the answer at glance and believed in the answer, (d) rethinking and redefining the problems and solutions: these two students looked at the answer and revealed that no other idea/way in solving the problem.Key words: thinking process, mild mental retardation, problem solving, story questions.Â

EKSPERIMENTASI MODEL PEMBELAJARAN KOOPERATIF TIPE JIGSAW DAN GROUP INVESTIGATION (GI) PADA PEMBELAJARAN DIMENSI TIGA SISWA KELAS X SMA NEGERI SE-KABUPATEN WONOGIRI DITINJAU DARI TINGKAT KECERDASAN EMOSIONAL TAHUN PELAJARAN 2012/2013 Tarmo, Tarmo; Riyadi, Riyadi; Sujadi, Imam
Journal of Mathematics and Mathematics Education Vol 4, No 1 (2014): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (310.585 KB)

Abstract: The objectives of this research were to investigate: (1) which one providing better learning achievement, the Jigsaw learning model, GI or direct instruction; 2) which one having better learning achievement, the students with high, medium or low emotional quotient (EQ); 3) in each category of EQ, which one providing better learning achievement, the Jigsaw, GI or direct instruction; 4) in each type of the learning model, which one having better learning achievement, the students with high, medium or low EQ. This research was a quasi-experimental research using factorial design of 3x3. The population of the research were all students of the Public Senior High Schools in Wonogiri Regency. The samples were chosen by using stratified cluster random sampling. The samples of the research were tenth grade students of SMA N 1 Wonogiri, SMA N 2 Wonogiri, and SMA N 1 Sidoharjo. In collecting the data, the instruments used were test and questionnaire. The technique of analyzing the data was unbalanced two-ways Anova. The results of the research are as follows: (1) the JigsawÂ result in a better learning achievement than GI and direct instruction, the GI result in a better learning achievement than direct instruction; (2) the students with the high EQ result in a better learning achievement than the students with the medium or low EQ, the students with the medium EQ result in a better learning achievement than the students with the low EQ; (3) the students with the low EQ, the Jigsaw, GI and direct instruction have the same learning achievement; the students with the medium EQ, the Jigsaw and GI result in the same learning achievement, the GI learning model and direct instruction result in the same learning achievement and the Jigsaw result in a better learning achievement than direct instruction; the students with the high EQ the Jigsaw and GI result in the same learning achievement, and both result in a better learning achievement than the direct instruction; (4) in the Jigsaw and GI, the students with the low and medium EQ result in the same learning achievement, but students with the high EQ result in a better learning achievement than the students with the low or medium EQ, in the direct instruction, the students with the low, medium and high EQ result in the same learning achievement.Key words: learning model, Jigsaw, GI, emotional quotient.

EKSPERIMENTASI MODEL PEMBELAJARAN KOOPERATIF TIPE JIGSAW DAN JIGSAW BERBANTU MEDIA FLASH PADAMATERI DIMENSI TIGA DITINJAU DARI GAYA BELAJAR SISWA KELAS XI SMK DI KABUPATEN SRAGEN TAHUN AJARAN 2015/2016 Kurniawati, Rina; Riyadi, Riyadi; Sujadi, Imam
Journal of Mathematics and Mathematics Education Vol 7, No 1 (2017): Journal of Mathematics and Mathematics Education
Publisher : Journal of Mathematics and Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (503.214 KB)

Abstract: This research was purposed to determine: (1) which one produced better mathematics learning achievement, cooperative learning model type Jigsawand Jigsaw Flash, or direct instruction; (2) which one had better mathematics learning achievement between students with visual learning style, those with auditory or those with kinesthetic learning style; (3) on each learning style, which one learning model that produced better mathematics learning achievement, cooperative learning model type Jigsawand Jigsaw Flash or direct instruction (4) on each learning model, which one student had better mathematics learning achievement , student who had visual learning style, those with auditory or those with kinesthetic learning style. This study was a quasi-experimental study with factorial 3x3 design. Population in this research were eleventh grade students of Vocational High School in Sragen. Sample collection were done by stratified cluster random sampling. Data collection were done by the method of documentation in order to test the balance of the population, the questionnaire were used to determine the students learning style and test were used to know the students achievement on material dimension three. Data analysis techniques used ANAVA two ways with unbalanced cells. The results of this study concluded as follows (1) cooperative learning model type Jigsaw Flash gave better mathematics learning achievement than cooperative learning type Jigsaw and direct instruction, cooperative learning type Jigsaw gave better mathematics learning achievement than direct instruction; (2) Students with kinesthetic learning style had better mathematics learning achievement than students with visual learning style and auditory learning style; students with visual learning style had better mathematics learning achievement than students with auditory learning style; (3) on each learning style, cooperative learning model type Jigsaw Flash gave better mathematics learning achievement than cooperative learning type Jigsaw and direct instruction, cooperative learning type Jigsaw gave better mathematics learning achievement than direct instruction; (4) on each learning model (Jigsaw, Jigsaw Flash, and direct instruction), students with kinesthetic learning style had better mathematics learning achievement than students with visual learning style and auditory learning style with visual learning style had better mathematics learning achievement than students with auditory learning style.Keywords: Learning Model, Jigsaw, Jigsaw Flash, Learning Style, learning achievement

Title

Found 31 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 31 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 31 Documents
Search