@article{DAN_1991_321_3_a9,
     author = {V. V. Filippov},
     title = {Asymptotic integration of ordinary differential equations with},
     journal = {Doklady Akademii Nauk},
     pages = {482--485},
     publisher = {mathdoc},
     volume = {321},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_321_3_a9/}
}