Geodesic
On an investigation of ordinary differential equations “with respect to the first approximation”
Differencialʹnye uravneniâ, Tome 28 (1992) no. 8, pp. 1351-1355 
V. V. Filippov. On an investigation of ordinary differential equations “with respect to the first approximation”. Differencialʹnye uravneniâ, Tome 28 (1992) no. 8, pp. 1351-1355. http://geodesic.mathdoc.fr/item/DE_1992_28_8_a7/
@article{DE_1992_28_8_a7,
     author = {V. V. Filippov},
     title = {On an investigation of ordinary differential equations {\textquotedblleft}with respect to the first approximation{\textquotedblright}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1351--1355},
     year = {1992},
     volume = {28},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_8_a7/}
}
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