Vincent E, E. (2014) “THE EFFECT OF SEWAGE CONCENTRATIONS AND MATERIALS OF CONSTRUCTION OF SEWAGE DIGESTER ON BIOGAS PRODUCTION”, Innovare Journal of Engineering and Technology, 2(2), pp. 1–4. Available at: https://www.journals.innovareacademics.in/index.php/ijet/article/view/981 (Accessed: 13 March 2026).