Nguyen Ba Mui, Dang Thai Hai, Bui Huy Doanh and Preston T R 2010 Effect of supplementation with cassava leaf hay on growth rate of indigenous (Co) goats and  F1 (Bach Thao x Co) crossbred goats kept under a free ranging system  (Editor: Reg Preston) International Conference on Livestock, Climate Change and Resource Depletion, Champasack University, Pakse, LAO PDR, 9-11 November 2010 . httm://www.mekarn.org/workshops/pakse/html/mui.hua.htm