Le Thi Men, Vo Minh Goi, Nguyen Hai Dang and Nguyen My Tuyen 2008 The prevalence, usages and nutritional components of Rau Dua (Ludwidgia adscendens) and Rau Sam (Portulaca oleracea) as animal feed in the Mekong Delta of Vietnam. 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/nha-agu.htm