Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1972_8_7_a22, author = {L. V. Trigubovich}, title = {Certain sufficient criteria for the reducibility of second order linear systems}, journal = {Differencialʹnye uravneni\^a}, pages = {1323--1325}, publisher = {mathdoc}, volume = {8}, number = {7}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_7_a22/} }
L. V. Trigubovich. Certain sufficient criteria for the reducibility of second order linear systems. Differencialʹnye uravneniâ, Tome 8 (1972) no. 7, pp. 1323-1325. http://geodesic.mathdoc.fr/item/DE_1972_8_7_a22/