Ngo Hong Chin and Khuc Thi Hue 2012 Supplementing Tithonia diversifolia with Guinea grass or tree foliages: effects on feed intake and live weight gain of growing goats.                      Proceedings of the International Conference "Livestock-Based Farming Systems, Renewable  Resources and the Environment", 6-9 June 2012, Dalat, Vietnam (Editors: Reg Preston and Sisomphone Southavong) http:/www.mekarn.org/workshops/dalat2012/html/chin.grrc.htm