@article{SM_1985_51_1_a8,
     author = {L. Yu. Motylev},
     title = {Formal asymptotic solutions of a~class of ordinary differential equations in the neighborhood of a~turning point},
     journal = {Sbornik. Mathematics},
     pages = {129--139},
     year = {1985},
     volume = {51},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1985_51_1_a8/}
}