Kistriyani, Lilis, Zainus Salimin, and Achmad Chafidz. “Utilization of Extracellular Polymeric Substances (EPS) Immobilized in Epoxy Polymer As Double Ion Exchanger Biosorbent for Removal of Chromium from Aqueous Solution”. Communications in Science and Technology 5, no. 1 (July 2, 2020): 40-44. Accessed August 13, 2020. https://cst.kipmi.or.id/journal/article/view/179.