Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1985_21_11_a23, author = {V. L. Rabtsevich}, title = {Necessary and sufficient conditions for formal reducibility}, journal = {Differencialʹnye uravneni\^a}, pages = {2006--2007}, publisher = {mathdoc}, volume = {21}, number = {11}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_11_a23/} }
V. L. Rabtsevich. Necessary and sufficient conditions for formal reducibility. Differencialʹnye uravneniâ, Tome 21 (1985) no. 11, pp. 2006-2007. http://geodesic.mathdoc.fr/item/DE_1985_21_11_a23/