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Original Russian Text © S.A. Stepin, V.V. Fufaev, 2015, published in Doklady Akademii Nauk, 2015, Vol. 462, No. 3, pp. 283–287.
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Stepin, S.A., Fufaev, V.V. Phase integral method in the problem of quasiclassical localization of spectra. Dokl. Math. 91, 318–322 (2015). https://doi.org/10.1134/S1064562415030175
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DOI: https://doi.org/10.1134/S1064562415030175