Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1991_27_5_a21, author = {V. P. Derevenskii}, title = {Solvability in quadratures of second-order matrix differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {901--904}, publisher = {mathdoc}, volume = {27}, number = {5}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1991_27_5_a21/} }
V. P. Derevenskii. Solvability in quadratures of second-order matrix differential equations. Differencialʹnye uravneniâ, Tome 27 (1991) no. 5, pp. 901-904. http://geodesic.mathdoc.fr/item/DE_1991_27_5_a21/