@article{DE_1971_7_6_a18,
     author = {M. V. Zaretskii},
     title = {The reducibility of certain linear differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1114--1115},
     year = {1971},
     volume = {7},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_6_a18/}
}