Geodesic
On the problem of an approximate solution for systems of ordinary differential equations based on Čaplygin's method
Differencialʹnye uravneniâ, Tome 1 (1965) no. 7, pp. 923-928 
A. N. Vityuk. On the problem of an approximate solution for systems of ordinary differential equations based on Čaplygin's method. Differencialʹnye uravneniâ, Tome 1 (1965) no. 7, pp. 923-928. http://geodesic.mathdoc.fr/item/DE_1965_1_7_a6/
@article{DE_1965_1_7_a6,
     author = {A. N. Vityuk},
     title = {On the problem of an approximate solution for systems of ordinary differential equations based on {\v{C}aplygin's} method},
     journal = {Differencialʹnye uravneni\^a},
     pages = {923--928},
     year = {1965},
     volume = {1},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_7_a6/}
}
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