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@article{DAN_1964_157_6_a1, author = {A. D. Bruno}, title = {The normal form of differential equations}, journal = {Doklady Akademii Nauk}, pages = {1276--1279}, publisher = {mathdoc}, volume = {157}, number = {6}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1964_157_6_a1/} }
A. D. Bruno. The normal form of differential equations. Doklady Akademii Nauk, Tome 157 (1964) no. 6, pp. 1276-1279. http://geodesic.mathdoc.fr/item/DAN_1964_157_6_a1/