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3. H. R. Rosenberg, in “Protein and Amino Acid Nutrition,” ed. by A. A. Albanase, Academic Press, New York and London, 1959, p. 405.
4. J. M. McLaughlan and J. A. Campbell, in “Mammalian Protein Metabolism,” Vol. III, ed. by H. N. Munro, Academic Press, New York and London, 1969, p. 391.
5. “Nutrient Requirements of Laboratory Animal,” National Academy of Sciences-National Research Council, Nutrient Requirements of Domestic Animals, No. 10, 1972, p. 84.