Co-Authors Benny Pinontoan Conny M. Mandagi Effendi P Sitanggang Ferdinand Wongkar Frangky E Kaparang Hermita Paputungan Hesky Kolibu Ixchel F. Mandagi James Tumbal Jeannette F Pangemanan Kawilarang Warouw Alex Masengi Meita J. W. Lepar Ronald Y. Boka Steiva A. S Wowiling Victoria E. N Manoppo Vivanda O.J Modaso