@article{DE_1974_10_11_a9,
     author = {A. M. Samoilenko and N. A. Perestyuk},
     title = {N. {N.} {Bogoljubov's} second theorem for systems of differential equations with impulse action},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2001--2009},
     publisher = {mathdoc},
     volume = {10},
     number = {11},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_11_a9/}
}