3 citations to https://www.mathnet.ru/rus/im8542
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A.A. Arzhanov, S.A. Stepin, V.A. Titov, V.V. Fufaev, “Stokes Phenomenon and Spectral Locus in a Problem of Singular Perturbation Theory”, Russ. J. Math. Phys., 31:3 (2024), 351
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S. A. Stepin, V. V. Fufaev, “Wkb asymptotics and spectral deformation in semi-classical limit”, J. Dyn. Control Syst., 26:1 (2020), 175–198
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Shafarevich A., “Quantization Conditions on Riemannian Surfaces and Spectral Series of Non-Selfadjoint Operators”, Formal and Analytic Solutions of Diff. Equations, Springer Proceedings in Mathematics & Statistics, 256, eds. Filipuk G., Lastra A., Michalik S., Springer, 2018, 177–187