@article{DE_1971_7_5_a11,
     author = {V. B. Demidovich},
     title = {Regular linear difference systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {902--909},
     publisher = {mathdoc},
     volume = {7},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_5_a11/}
}