1. Overend RP . Direct combustion of biomass. Renewable Energy sources charged with energy from the sun and originated from earth-moon interaction. 〈http://www.eolss.net/sample-chapters/c08/e3-08-01-04.pdf〉
2. Biomass conversion processes;Kucuk;Energy Conversat Mgmt,1997
3. Biomass - resource for sustainable development;Pathak;Int J Adv Res Technol,2013
4. Energy and fuel wood;Sims,2003
5. Biomass gasification processes in downdraft fixed bed reactors: a review;Bhavanam;Int J Chem Eng Appl,2011