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@article{DE_1969_5_8_a5, author = {G. S. Krechetov}, title = {The connection between the solutions of two systems of differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1398--1404}, publisher = {mathdoc}, volume = {5}, number = {8}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_8_a5/} }
G. S. Krechetov. The connection between the solutions of two systems of differential equations. Differencialʹnye uravneniâ, Tome 5 (1969) no. 8, pp. 1398-1404. http://geodesic.mathdoc.fr/item/DE_1969_5_8_a5/