1. Leeuwen, P. H. van, and Huisman, H. O., Rec. Trav. Chim., 80, 1115 (1961).
2. Robeson, C. D., Cawley, J. D., Weisler, L., Stern, M. H., Eddinger, C. C., and Chechak, A. J., J. Amer. Chem. Soc., 77, 4111 (1955).
3. Thompson, J. N., and Pitt, G. A. J., Nature, 188, 672 (1960).
4. Thompson, J. N., Howell, J. McC., and Pitt, H. A. J., Biochem. J., 80, 16, P (1961).
5. Thompson, J. N., Howell, J. McC., and Pitt, H. A. J., Biochem. J., 80 25, P (1961).