@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/}
}