1. The utilization of food elements by growing chicks;Ackerson;IX. The nitrogen of urea. Neb. Agr. Exp. Sta. Bul.,1940
2. The nutritive value of the non-protein of feeding stuffs;Armsby;U. S. Dept. Agr. Bur. An. Ind. Bul.,1911
3. The influence of urea ingestion on the nitrogen balance and energy metabolism of rats;Kriss;J. Nut.,1940
4. The biochemistry of the amino acids;Mitchell;New York: Chem. Cat. Co. Inc. Am. Chem. Soc. Monograph Series: 619.,1929