Nguyen Thi Hoa Ly, Le Duc Ngoan and A C Beynen 2008 Ileal and total tract digestibility in fattening pigs fed ensiled cassava root with protein supplied by cassava leaves and sweet potato vines in both ensiled and dry form.  Proceedings MEKARN Regional Conference 2007: Matching Livestock Systems with Available Resources (Editors: Reg Preston and Brian Ogle), Halong Bay, Vietnam, 25-28 November 2007 http://www.mekarn.org/prohan/hoaly1.htm