Le Thi Men 2009 Rau Dua (Ludwidgia adscendens) as component of recycling systems in pig production in the Mekong Delta of Vietnam.  (Editors: Reg Preston and Brian Ogle) International Conference on Livestock, Climate Change and the Environment, An Giang University, Vietnam, 16-18 October 2009. httm://www.mekarn.org/workshops/environ/proenv/lemen.htm