@article{DAN_1960_132_1_a3,
     author = {L. R. Volevich},
     title = {On general systems of differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {20--23},
     publisher = {mathdoc},
     volume = {132},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_132_1_a3/}
}