@article{DE_1989_25_6_a6,
     author = {A. M. Samoilenko and R. I. Petrishin},
     title = {The averaging method in some boundary value problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {956--964},
     publisher = {mathdoc},
     volume = {25},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_6_a6/}
}