@article{DAN_1985_280_2_a10,
     author = {V. V. Filippov},
     title = {An axiomatic theory of spaces of solutions of ordinary},
     journal = {Doklady Akademii Nauk},
     pages = {304--308},
     publisher = {mathdoc},
     volume = {280},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_280_2_a10/}
}