Chhay Ty and Preston T R 2005: Effect of water spinach and fresh cassava leaves on intake, digestibility and N retention in growing pigs;   Workshop-seminar "Making better  use of local feed resources" (Editors: Reg Preston and Brian Ogle) MEKARN-CTU, Cantho, 23-25 May, 2005. Article #26. Retrieved, from http://www.mekarn.org/proctu/chha26.htm