1. and , mentioned from A. E. Harper, in: Mammalian protein metabolism. Ed. by and , p. 88. Academic Press, New York 1964.
2. in: Protein human nutrition. Ed. by and . p. 453–467. Academic Press, London, New York 1973.
3. , and , Anales del Instituto Nacional de Investigaciones Agrarias, no. 15, Serie Ganadera, p. 39–44 (1982).