Galarpe, V. R. K. R., and G. D. Leopoldo. “Potential Recovery of Silver (Ag) from X-Ray Fixer Waste by Alkaline Treatment”. Engineering, Technology & Applied Science Research 7, no. 5 (October 19, 2017): 2094–2097. Accessed January 17, 2022. https://etasr.com/index.php/ETASR/article/view/1526.