1. A. N. Egorochkin, S. Ya. Khoroshev, N. S. Vyazankin, E. N. Gladyshev, V. T. Bychkov, and O. A. Kruglaya, Zh. Obshch. Khim.,38, 276 (1968).
2. S. G. Shevchenko, E. I. Brcidskaya, Yu. L. Frolov, A. M. Skylyanova, R. G. Mirskov, and M. G. Voronkov, Zh. Obshch. Khim.,44, 1925 (1974).
3. Rupture Energy of Chemical Bonds. Ionization Potentials and Electron Affinity [in Russian], Nauka (1974), pp. 228, 229.
4. Advances in Photonics [in Russian], Izd. Leningr. Univ. (1975), p. 123.
5. M. Tsutsui, Ann. N. Y. Acad. Sci., 125, Part 1, 147 (1965).