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@article{DE_1977_13_6_a1, author = {V. V. Basov}, title = {Formal and analytic equivalence of real systems of differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {981--991}, publisher = {mathdoc}, volume = {13}, number = {6}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_6_a1/} }
V. V. Basov. Formal and analytic equivalence of real systems of differential equations. Differencialʹnye uravneniâ, Tome 13 (1977) no. 6, pp. 981-991. http://geodesic.mathdoc.fr/item/DE_1977_13_6_a1/