Sajeena Beevi. B and  Jose P. P. and  G. Madhu,  Optimization of Process Parameters Affecting Biogas Production from Organic Fraction of Municipal Solid Waste via Anaerobic Digestion .   journal   = {International Journal of Bioengineering and Life Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 43 - 48
    [viewed 15 October 2019]. Available from: https://publications.waset.org/pdf/9997252.