Nguyen Thi Kim Khang and Ogle B  2004:  Effects of replacing roasted soya beans by broken rice and duckweed on performance of growing Tau Vang chickens confined on-station and scavenging on-farm.  Livestock Research for Rural Development. Vol. 16, Art. #56. Retrieved , from http://www.lrrd.org/lrrd16/8/khan16056.htm