1. Baxter, J. G. Biological Symposia XII, (1947).
2. Baxter, J. G., and Stern, M. H. Analytical Chemistry. In press
3. Dam, H.,et al. Kgl. Danske Videnscab Selskab. Biol. Med.16, 7 (1941).
4. Evelyn, J. Biol. Chem.115, 63–75 (1936).
5. Hickman, K. C. D. Ind. Eng. Chem. Anal. Ed.14, 253 (1942).