Ali, Ismat, M Mohsin Ali, M A Basit, and A Rasheed Khanb. 2004. “PRODUCTION OF BIOGAS AT MESOPHILIC AND THERMOPHILIC TEMPERATURES”. Biological Sciences - PJSIR 47 (1):5-8. http://www.v2.pjsir.org/index.php/biological-sciences/article/view/1444.