1. Fraenkel, G., and Friedman, S., “Vitamins and Hormones”, 15 (1957).
2. Schaepdryver, A. F. de, and Vleeschhouwer, G. R. de, Arch. Intern. Pharmacodynamie, 113, 15 (1957).
3. Fritz, I. B., and McEwan, B., Science, 129, 334 (1959).
4. Binon, F., and Deltour, G., Experientia, 12, 357 (1956).
5. Binon, F., and Deltour, G., C.R. Soc. Biol., 149, 932 (1955).