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2. G. Herzberg, Infrared and Raman Spectra, D. Van Nostrand, Princeton (1968);
3. B. Mentzen, Spectroscopies infrarouge et raman. Monographies du CAST, Masson, Paris (1974);
4. J. Lecomte, Handbuch des Physik 26, Springer-Verlag (1958), p. 244;
5. G. M. Barrow, Introduction to Molecular Spectroscopy, McGraw-Hill, New-York (1962).