@article{DE_1984_20_8_a30,
     author = {D. N. Cheban},
     title = {Periodic and quasiperiodic solutions of linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1455--1456},
     year = {1984},
     volume = {20},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_8_a30/}
}