1. European Commission. 2012. EU energy roadmap 2050. .
2. Upgradation of biogas using combined method of alkaline water scrubbing and adsorption through carbon molecular sieve;Tarang;Int J Chem Tech Res,2013
3. Climate balance of biogas upgrading systems;Pertl;Waste Manage,2010
4. Techniques for removal of CO2 and H2S from biogas;Bhattacharya,1988
5. Water scrubbing: a better option for biogas purification for effective storage;Ofori-Boateng;World Appl Sci J,2009