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2. A. E. Borisov, N. V. Novikova, N. A. Chumaevskii, and E. B. Shkirtil', Ukrainsk. Fiz. Zh.,13, No. 1, 75 (1968).
3. N. A. Chumaevskii, Vibration Spectra of Group IV B and V B Organo-Element Compounds [in Russian], Nauka, Moscow (1971).
4. M. V. Vol'kenshtein, L. A. Gribov, M. A. El'yashevich, and B. I. Stepanov, Vibrations of Molecules [in Russian], Nauka, Moscow (1972).
5. N. A. Chumaevskii, Opt. Spektrosk.,13, No. 1, 68 (1962).