Formal asymptotic solutions of a~class of ordinary differential equations in the neighborhood of a~turning point
Sbornik. Mathematics, Tome 51 (1985) no. 1, pp. 129-139

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Formal asymptotic solutions are constructed for a class of ordinary differential equations of $n$th order with small parameter that have a turning point. An integral representation is proposed for solutions in a small neighborhood of the turning point. Bibliography: 10 titles.
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     author = {L. Yu. Motylev},
     title = {Formal asymptotic solutions of a~class of ordinary differential equations in the neighborhood of a~turning point},
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L. Yu. Motylev. Formal asymptotic solutions of a~class of ordinary differential equations in the neighborhood of a~turning point. Sbornik. Mathematics, Tome 51 (1985) no. 1, pp. 129-139. http://geodesic.mathdoc.fr/item/SM_1985_51_1_a8/