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@article{DAN_1967_174_5_a1, author = {A. D. Bruno}, title = {The divergence of transformations to normal form of differential equations}, journal = {Doklady Akademii Nauk}, pages = {1003--1006}, publisher = {mathdoc}, volume = {174}, number = {5}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_174_5_a1/} }
A. D. Bruno. The divergence of transformations to normal form of differential equations. Doklady Akademii Nauk, Tome 174 (1967) no. 5, pp. 1003-1006. http://geodesic.mathdoc.fr/item/DAN_1967_174_5_a1/