Nguyen Thi Kim Dong and Nguyen Van Thu 2012 Effect of fresh water hyacinth (Eichhornia craszsipes L.) in the diets on growth rate, nutrient digestibility and economic analysis of local goose in the Mekong delta of Vietnam.  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/kimdong.ctu2.htm