Gerald E. Lobley, Xiangzhen Shen, Guowei Le, David M. Bremner, Eric Milne, A. Graham Calder, Susan E. Anderson, Ngaire Dennison,
Oxidation of essential amino acids by the ovine gastrointestinal tract. British Journal of Nutrition. ,vol. 89, pp. 617- 629 ,(2003) ,
10.1079/BJN2003831