1. Broszkiewicz, R., Minc, S., and Zagorski, Z. P., Rep. 123/ChR, Institute of Nuclear Research, Warsaw (December 1959). Broszkiewicz, R., Minc, S., and Zagorski, Z. P., Bull. Acad. Pol. Sci., 8, 103 (1960).
2. Chernova, A. I., Orekhov, V. D., and Porskurnin, M. A., Trans. Second All-Union Conf. Radiation Chemistry, 233 (Moscow, 1962).
3. Sugimoto, K., Ando, W., and Oae, S., Bull. Chem. Soc. Jap., 36, 124 (1963).
4. Sidgwick, N. V., The Organic Chemistry of Nitrogen, 265 (Oxford University Press, 1942).