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Additional information
M. V. Lomonosov Moscow State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 19, No. 2, pp. 233–236, May, 1974.
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Elyutin, P.V., Krivchenkov, D.V. On the applicability of the quasiclassical approximation. Theor Math Phys 19, 477–479 (1974). https://doi.org/10.1007/BF01035948
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DOI: https://doi.org/10.1007/BF01035948