1. Collins, C. H., Collins, K. E., Ghoos, Y. F., and Apers, D. J., Radiochim. Acta, 4, 211 (1964).
2. Ackerhalt, R. E., Collins, C. H., and Collins, K. E., Abstracts 155th National Meeting, Division of Nuclear Chemistry and Technology, San Francisco, April 1968 (Amer. Chem. Soc, 1968).
3. Andersen, T., and Sørensen, G., Trans. Faraday Soc., 62, 3427 (1966).
4. Ackerhalt, R. E., Collins, C. H., and Collins, K. E., Trans. Faraday Soc., 67 (1971).
5. Ackerhalt, R. E., Collins, C. H., and Collins, K. E., Trans. Faraday Soc., 65, 1927 (1969).