Gnanambal, Venkatachalam Sundaresan, and Krishnaswamy Swaminathan. “Biogas Production from Renewable Lignocellulosic Biomass”. International Journal of Environment 4, no. 2 (June 3, 2015): 341–347. Accessed April 25, 2024. https://www.nepjol.info/index.php/IJE/article/view/12662.