Hang Du Thanh, Linh Nguyen Quang, Everts H and Beynen A C 2009: Ileal and total tract digestibility in growing pigs fed cassava root meal and rice bran with inclusion of cassava leaves, sweed potato vine, duckweed and stylosanthes foliage. Livestock Research for Rural Development. Volume 21, Article #12. Retrieved , from http://www.lrrd.org/lrrd21/1/hang21012.htm