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@article{DAN_1983_273_4_a1, author = {A. D. Bruno}, title = {Analytic invariants of a differential equation}, journal = {Doklady Akademii Nauk}, pages = {781--785}, publisher = {mathdoc}, volume = {273}, number = {4}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_4_a1/} }
A. D. Bruno. Analytic invariants of a differential equation. Doklady Akademii Nauk, Tome 273 (1983) no. 4, pp. 781-785. http://geodesic.mathdoc.fr/item/DAN_1983_273_4_a1/