References
M. V. Fedoryuk, Asymptotic Methods for Linear Ordinary Differential Equations, in Reference Mathematical Library (Nauka, Moscow, 1983) [in Russian].
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Original Russian text © A. A. Ershov, 2009, published in Matematicheskie Zametki, 2009, Vol. 85, No. 1, pp. 134–138.
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Ershov, A.A. Asymptotic expansion of the solution of a second-order equation. Math Notes 85, 123–127 (2009). https://doi.org/10.1134/S0001434609010131
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DOI: https://doi.org/10.1134/S0001434609010131