ลิ้มควรสุวรรณ ว. ., วังใน ช. ., and ชัยประเสริฐ ภ. ., “Chracterization of an Anaerobic Baffled- Fixed Film Reactor (ABFFR) in Treating and Producing Biogas From Palm oil mill Effluent”, j.eng.rmutt, vol. 1, pp. 49–59, Jun. 2010.