1. H. Nakagawa, “Protein Nutrition,” ed. by S. Akabori and H. Nakagawa, Kodansha, Tokyo, 1978, p. 108.
2. R. W. Wannermacher, Jr. and J. B, Allison, “Protein Nutrition Amino Acid Patterns,” ed. by J. H. Leathern, reprinted by the University of Tokyo Press under an arrangement with Rutgers University Press, Tokyo, 1970, p. 206.