Nguyen Xuan Ba, Vu Duy Giang, Le Duc Ngoan and Vu Chi Cuong 2005: The nutritive value of Hibiscus rosa siensis foliage sillage (HS) and the effect of supplement levels of HS on feed intake, digestibility, N-retention and rumen environment of sheep and goat. Workshop-seminar "Making better  use of local feed resources" (Editors: Reg Preston and Brian Ogle) MEKARN-CTU, Cantho, 23-25 May, 2005. Article #22. Retrieved, from http://www.mekarn.org/proctu/ba2_22.htm