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Additional information
M. V. Lomonosov Moscow State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 31, No. 3, pp. 327–332, June, 1977.
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Shirokov, Y.M. Perturbation theory with respect to Planck's constant. Theor Math Phys 31, 488–492 (1977). https://doi.org/10.1007/BF01030565
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DOI: https://doi.org/10.1007/BF01030565