Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1994_335_4_a2, author = {A. D. Bruno}, title = {First approximations of differential equations}, journal = {Doklady Akademii Nauk}, pages = {413--416}, publisher = {mathdoc}, volume = {335}, number = {4}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1994_335_4_a2/} }
A. D. Bruno. First approximations of differential equations. Doklady Akademii Nauk, Tome 335 (1994) no. 4, pp. 413-416. http://geodesic.mathdoc.fr/item/DAN_1994_335_4_a2/