1. Dubost, P., and Pascal, S., Ann. Pharmaceut. Franc., 11, 615 (1953). Leach, H., and Crimm, W. R. C., J. Clin. Path., 9, 164 (1956).
2. Salzman, N. P., and Brodie, B. B., J. Pharm. Exp. Therap., 118, 46 (1956).
3. Granick, S., and Michaelis, L., J. Amer. Chem. Soc., 69, 2983 (1947).