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@article{DE_1969_5_1_a13, author = {V. K. Romanko}, title = {Systems with first order derivative in the ``time''}, journal = {Differencialʹnye uravneni\^a}, pages = {174--185}, publisher = {mathdoc}, volume = {5}, number = {1}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_1_a13/} }
V. K. Romanko. Systems with first order derivative in the ``time''. Differencialʹnye uravneniâ, Tome 5 (1969) no. 1, pp. 174-185. http://geodesic.mathdoc.fr/item/DE_1969_5_1_a13/