1. Coulson, A. F. W., Knowles, J. R., and Offord, R. E., Chem. Commun., 7 (1970).
2. Cleland, W. W., Biochemistry, 3, 480 (1964).
3. Carpenter, F. H., in Methods in Enzymology (edit. by Hirs, C. H. W.), 11, 237 (Academic Press, New York, 1967).
4. Dawson, R. M. C., Elliott, D. C., Elliott, W. H., and Jones, K. M., Data for Biochemical Research (second ed.), 529 (Clarendon Press, Oxford, 1969).
5. Gray, W. R., in Methods in Enzymology (edit. by Hirs, C. H. W.), 11, 469 (Academic Press, New York, 1967).