@article{DE_2002_38_11_a12,
     author = {I. V. Gaishun},
     title = {Some {Properties} of {Linear} {Nonstationary} {Discrete} {Systems} over {Rings}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1540--1548},
     publisher = {mathdoc},
     volume = {38},
     number = {11},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_11_a12/}
}