On the question of the existence of a transformation to normal form
Differencialʹnye uravneniâ, Tome 9 (1973) no. 6, pp. 1149-1150.

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     author = {A. V. Osipov},
     title = {On the question of the existence of a transformation to normal form},
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A. V. Osipov. On the question of the existence of a transformation to normal form. Differencialʹnye uravneniâ, Tome 9 (1973) no. 6, pp. 1149-1150. http://geodesic.mathdoc.fr/item/DE_1973_9_6_a20/