Nguyen Van Sao, Nguyen Thi Mui and Đinh Van Binh 2008 Biomass production of Tithonia diversifolia (Wild Sunflower), soil improvement on sloping land and use as high protein foliage for feeding goats.  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/sao.htm