Nguyen thi Hong Nhan, Nguyen Van Hon, Nguyen Thiet and Somchai Chanpongsang 2010 Developing pasture grass system on seasonally waterlogged and dry soil and effect of cottonseed cake and Trichantera gigantea on milk production in Khmer ethnic farms.  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/nhan2.htm