Voir la notice de l'article provenant de la source Math-Net.Ru
@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}, publisher = {mathdoc}, volume = {7}, number = {6}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_6_a18/} }
M. V. Zaretskii. The reducibility of certain linear differential systems. Differencialʹnye uravneniâ, Tome 7 (1971) no. 6, pp. 1114-1115. http://geodesic.mathdoc.fr/item/DE_1971_7_6_a18/