Nguyen Thi Hong Nhan and Nguyen Thiet 2012 Effects of Tithonia diversifolia, Trichanthera gigantea and Psophocarpus scandens on growth rate and digestibility in 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/nhanctu2.htm