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@article{MAN_1991__291_1_164868, author = {Sebastian Walcher}, title = {On differential equations in normal form.}, journal = {Mathematische Annalen}, pages = {293--314}, publisher = {mathdoc}, volume = {291}, number = {1}, year = {1991}, zbl = {0754.34032}, url = {http://geodesic.mathdoc.fr/item/MAN_1991__291_1_164868/} }
Sebastian Walcher. On differential equations in normal form.. Mathematische Annalen, Tome 291 (1991) no. 1, pp. 293-314. http://geodesic.mathdoc.fr/item/MAN_1991__291_1_164868/