@article{IM2_1987_29_2_a4,
     author = {V. V. Kucherenko and Yu. V. Osipov},
     title = {Exact and asymptotic solutions of systems with turning points},
     journal = {Izvestiya. Mathematics },
     pages = {355--370},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1987_29_2_a4/}
}