1. BOCKUS, H. L. (1965) : Gastroenterology, Vol. III, p. 1262, 2nd Ed., W. B. Saunders.
2. COOPERMAN, J. M., ELVEHJEM, C. A., MACCALL, K. B. AND RUEGAMER, W. R. (1946) : “Folic acid” active compounds in the nutrition of the monkey. Proc. Soc. Exptl. Biol. Med., 61, 92-97.
3. DAY, P. L. (1944) : The nutritional requirements of primates other than man. Vitam. & Horm., 2, 71-105.
4. DAY, P. L. AND TOTTER, J. R. (1948) : Pteroyglutamic acid balance studies on monkeys. J. Nutr., 36, 803-812.
5. FAWCETT, J. K. AND SCOTT, J. E. (1960) : A rapid and precise method for the determination of urea. J. Clin. Pathol., 13, 156-159.