@article{DE_1990_26_8_a7,
     author = {A. F. Filippov},
     title = {Perturbations of linear systems with quasiperiodic coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1343--1348},
     publisher = {mathdoc},
     volume = {26},
     number = {8},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_8_a7/}
}