Nguyen Thi Kim Dong and Nguyen Van Thu 2008 Effect of dietary fiber sources on feed intake, nutrient digestibility, growth rate, and economic returns of growing crossbred rabbits fed sweet potato vine (Ipomoea batatas) and para grass (Brachiaria mutica)  Proceedings MEKARN Regional Conference 2007: Matching Livestock Systems with Available Resources (Editors: Reg Preston and Brian Ogle), Halong Bay, Vietnam, 25-28 November 2007 http://www.mekarn.org/prohan/kdong1.htm