1. Hayes, W. J., DDT, edit. by Muller, Paul, 2, 106 (Birkhausen Verlag, Basle, 1959).
2. Bubl, Edward C., and Butts, Joseph S., J. Nutrition, 70, 211 (1960).
3. Knoche, Ingo, and Hartmann, Fritz, Biochem. Z., 334, 269 (1961).
4. Willmer, J. S., Canad. J. Biochem. and Physiol., 38, 1449 (1960).