1. Schade, A. L., Reinhart, R. W., and Levy, H., Arch. Biochem., 20, 170 (1949).
2. Fraenkel-Conrat, H., and Feeney, R. E., Arch. Biochem., 29, 101 (1950).
3. Warner, R. C., and Weber, I., J. Amer. Chem. Soc., 75, 5094 (1953).
4. Schade, A. L., Il Farmaco, 2, 185 (1964).
5. Woodworth, R. C., Protides Biol. Fluids, 14, 37 (1966).