Trinh Thi Lan and Le Tran Minh Khoa 2012 Utilization of biodigester effluent for production of chlorella.  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/lan.agu.htm