1. Barker, M. H. (1936). J. Amer. med. Ass., 106, 762.
2. Compare Norris, R. F., Martens, V. E., and Sunderman, F. W. (1945). Amer. J. clin. Path., 15, 196.
3. Brodie, B. B., Udenfriend, S., and Cobum, A. F. (1944). J. Pharmacol., 80, 114.
4. Camponovo, P. B. (1945). Rev. Soc. argent. Biol., 21, 309.
5. Camponovo, P. B. (1946). Rev. Soc. bioquim. argent., 13, 67.