@article{DAN_1978_241_2_a4,
     author = {A. A. Martynyuk},
     title = {On a theorem of the type of {Bogolyubov's} first averaging theorem},
     journal = {Doklady Akademii Nauk},
     pages = {279--281},
     publisher = {mathdoc},
     volume = {241},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_241_2_a4/}
}