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3. L. S. Mayants, Theory and Calculation of Molecular Vibrations [in Russian], Izd-vo AN SSSR, Moscow (1960).
4. Yu. A. Pentin and É. Sharipov, Physical Problems in Spectroscopy [in Russian], Vol. 1, Izd-vo AN SSSR, Moscow (1962).
5. Yu. A. Pentin and É. Sharipov, Vestn. MGU, Ser. Khim.,4, 30 (1963).