Nguyen Hieu Phuong and Nguyen Quang Thieu 2012 Effect of adding different Phyllanthus amarus powder concentrations in chicken diet on their growth performance and health. 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/phuon.ng.nlu3.htm