Geodesic
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 Cet article a éte moissonné depuis la source Math-Net.Ru

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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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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/

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