1. E. E. Nikitin, Dokl. Akad. Nauk SSSR, 119, 526 (1958).
2. E. Montroll and K. Schuller, Adv. Chem. Phys., 1, 361 (1958).
3. A. I. Osipov and E. V. Stupochenko, Usp. Fiz. Nauk, 79, 81 (1963).
4. N. M. Kuznetsov, Dokl. Akad. Nauk SSSR, 164, 1097 (1965).
5. A. I. Osipov, Theor. i Éksper. Khim., 2, 649 (1966).