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@article{DAN_1965_165_5_a1, author = {A. D. Bruno}, title = {On convergence of transforms of differential equations to the normal form}, journal = {Doklady Akademii Nauk}, pages = {987--989}, publisher = {mathdoc}, volume = {165}, number = {5}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_5_a1/} }
A. D. Bruno. On convergence of transforms of differential equations to the normal form. Doklady Akademii Nauk, Tome 165 (1965) no. 5, pp. 987-989. http://geodesic.mathdoc.fr/item/DAN_1965_165_5_a1/