Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1969_5_8_a19, author = {V. N. Laptinskii and V. V. Pugin}, title = {First order nonlinear matrix-valued differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1523--1525}, publisher = {mathdoc}, volume = {5}, number = {8}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_8_a19/} }
V. N. Laptinskii; V. V. Pugin. First order nonlinear matrix-valued differential equations. Differencialʹnye uravneniâ, Tome 5 (1969) no. 8, pp. 1523-1525. http://geodesic.mathdoc.fr/item/DE_1969_5_8_a19/