Permana, Rega, and . Junianto. “Potential Use of Modified Derivative of Chitin and Chitosan on Precious Metal Recovery: A Review”. Journal of Materials Science Research and Reviews 7, no. 2 (February 9, 2021): 14-24. Accessed April 22, 2021. https://journaljmsrr.com/index.php/JMSRR/article/view/30175.