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@article{DAN_1989_305_2_a7, author = {P. L. Ul'yanov}, title = {Classes of infinitely differentiable functions}, journal = {Doklady Akademii Nauk}, pages = {287--290}, publisher = {mathdoc}, volume = {305}, number = {2}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_305_2_a7/} }
P. L. Ul'yanov. Classes of infinitely differentiable functions. Doklady Akademii Nauk, Tome 305 (1989) no. 2, pp. 287-290. http://geodesic.mathdoc.fr/item/DAN_1989_305_2_a7/