@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},
     publisher = {mathdoc},
     volume = {1},
     number = {7},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_7_a6/}
}