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@article{DAN_1992_322_6_a3, author = {A. D. Bruno}, title = {Nondegeneracy conditions in the {Kolmogorov} theorem}, journal = {Doklady Akademii Nauk}, pages = {1028--1032}, publisher = {mathdoc}, volume = {322}, number = {6}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1992_322_6_a3/} }
A. D. Bruno. Nondegeneracy conditions in the Kolmogorov theorem. Doklady Akademii Nauk, Tome 322 (1992) no. 6, pp. 1028-1032. http://geodesic.mathdoc.fr/item/DAN_1992_322_6_a3/