Lemen 2009 Rau Dua (Ludwidgia adscendens) and Rau Dua as components of recycling systems in pig production in the Mekong delta. Proceedings MEKARN Workshop on  Livestock, Climate Change and the Environment (Editors: Reg Preston and Vo Lam ), An Giang University, Vietnam, 16-18 November 2009. http://www.mekarn.org/workshops/environ/Abstracts/lemen.htm