Moog F A, Avilla H F, Agpaoa E V, Valenzuela F G and Concepcion F C 1997:
Promotion and utilization of polyethylene biodigester in smallhold farming systems in the Philippines.
Livestock Research for Rural Development. Volume 9, Article #12.
Retrieved
, from http://www.lrrd.org/lrrd9/2/moog92.htm