Luu Huu Manh, Nguyen Nhut Xuan Dung, Bui Thi Le Minh and Mai Thuy Duong 2010 Treating pig wastewater by applying a model of fishpond or bio-digester tank followed by a fishpond in Phuoc Tho state farm.  International Conference on Livestock, Climate Change and Resource Depletion (Editor: Reg Preston),  Champasack University, Pakse, LAO PDR, 9-11 November 2010.  http://www.mekarn.org/workshops/pakse/html/manh.htm