1. Yielding, K. L., and Tomkins, G. M., in Recent Progress in Hormone Research XVIII (edit. by Pincus, G.), 467 (Academic Press, New York, 1962).
2. Pildes, R. B., Amer. J. Obst. Gynec., 91, 466 (1965).
3. Schmidt, E., in Methoden der Enzymatischen Analysen (edit. by Bergmeyer, H-U.), 752 (Verlag Chemie, Weinheim, 1962).
4. Hofmann, K., in Recent Progress in Hormone Research XVIII (edit. by Pincus, G.), 488 (Academic Press, New York, 1962).