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2. E. V. Babaev, Principles of Symmetry and Systemics in Chemistry [in Russian], Moscow (1987), p. 30.
3. L. Bellamy, New Information on the IR Spectra of Complex Molecules [Russian translation], Moscow (1971).
4. P. V. Sergeev (ed.), Biochemical Pharmacology [in Russian], Moscow (1982).
5. G. F. Bol'shakov, V. S. Vatago, and F. B. Agrest, The Ultraviolet Spectra of Heteroorganic Compounds, Leningrad (1969).