Nguyen Thi Hoa Ly 2005: Effect of supplementation of l-lysine and dl- methionine on the utilization of diets containing ensiled cassava leaves as a protein source for pigs in central Vietnam. Workshop-seminar "Making better  use of local feed resources" (Editors: Reg Preston and Brian Ogle) MEKARN-CTU, Cantho, 23-25 May, 2005. Article #36. Retrieved, from http://www.mekarn.org/proctu/hoal36.htm