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@article{DE_1982_18_5_a12, author = {A. P. Sadovskii}, title = {Normal forms of systems of differential equations with a nonzero linear part}, journal = {Differencialʹnye uravneni\^a}, pages = {827--832}, publisher = {mathdoc}, volume = {18}, number = {5}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_5_a12/} }
A. P. Sadovskii. Normal forms of systems of differential equations with a nonzero linear part. Differencialʹnye uravneniâ, Tome 18 (1982) no. 5, pp. 827-832. http://geodesic.mathdoc.fr/item/DE_1982_18_5_a12/