Geodesic
N. N. Bogoljubov's second theorem for systems of differential equations with impulse action
Differencialʹnye uravneniâ, Tome 10 (1974) no. 11, pp. 2001-2009 
A. M. Samoilenko; N. A. Perestyuk. N. N. Bogoljubov's second theorem for systems of differential equations with impulse action. Differencialʹnye uravneniâ, Tome 10 (1974) no. 11, pp. 2001-2009. http://geodesic.mathdoc.fr/item/DE_1974_10_11_a9/
@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},
     year = {1974},
     volume = {10},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_11_a9/}
}
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