“Sulfite Pretreatment on the Anaerobic Sludge Digester for Improving Methane Production and Volatile Solid Reduction”. Indian Journal of Chemical Technology (IJCT) 33, no. 2 (April 13, 2026): 258–265. Accessed May 30, 2026. https://or.niscpr.res.in/index.php/IJCT/article/view/20909.