@article{DE_1978_14_2_a22,
     author = {N. M. Matveev and S. L. Nosov and A. N. Pokrovskii},
     title = {On the question of the averaging principle},
     journal = {Differencialʹnye uravneni\^a},
     pages = {371--373},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_2_a22/}
}