@article{SM_1983_46_1_a3,
     author = {V. V. Kucherenko and Yu. V. Osipov},
     title = {Asymptotic solutions of ordinary differential equations with degenerate symbol},
     journal = {Sbornik. Mathematics},
     pages = {75--104},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_46_1_a3/}
}