9Inaba R, Furuichi T, Komatsu T, et al. Centralization of dairyfarming facilities for improved economics and environmentalquality[J]. Waste management,2009,29( 1) :214-223.
10Catelo M,Angles 0,Dorado M A,et al. Backyard and CommercialPiggeries in the Philippines : Environmental Consequences andPollution Control Options[R]. Singapore : Economy and Environ-ment Program for Southeast Asia,2001.