@article{DE_1970_6_5_a6,
     author = {V. N. Laptinskii},
     title = {On the theory of representations of integral matrices of linear differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {827--837},
     year = {1970},
     volume = {6},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_5_a6/}
}