@article{DE_1978_14_6_a7,
     author = {A. M. Samoilenko and N. A. Perestyuk},
     title = {Periodic solutions of weakly nonlinear systems with impulse action},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1034--1045},
     publisher = {mathdoc},
     volume = {14},
     number = {6},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_6_a7/}
}