Vo Duy Thanh, Preston T R and Nguyen Van Thu 2011 Mangosteen peel as modifier of fermentation in an in vitro incubation using potassium nitrate or urea as NPN source with molasses, Operculina turpethum meal and para grass as substrate. Workshop on Reducing Greenhouse Gas Emissions from Livestock and Soils (Editors: Reg Preston and Sisomphone Southavong). National Institute of Animal Science, Hanoi, 14-15 November 2011. httm://www.mekarn.org/workshops/GHG-CC/thanh.htm