Utilization of Snail (Achatina fulica) Shell Waste for Synthesis of Calcium Tartrate Tetrahydrate (CaC4H4O6.4H2O) Single Crystals in Silica Gel - Prananto, Yuniar P; Khunur, Mohammad M; Tjahjanto, Rachmat T; Sakdi, Imam; Basori, Muchammat C (Journal of Tropical Life Science, 2012)