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4. E. P. Gordov and S. D. Tvorogov, The Method of Semiclassical Representation in Quantum Theory [in Russian], Nauka, Novosibirsk (1984).
5. E. P. Gordov and A. Z. Fazliev, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 9, 66 (1983).