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@article{MZM_1990_47_3_a4, author = {\`E. M. Galeev}, title = {Approximation of classes of periodic functions of several variables by nuclear operators}, journal = {Matemati\v{c}eskie zametki}, pages = {32--41}, publisher = {mathdoc}, volume = {47}, number = {3}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_3_a4/} }
È. M. Galeev. Approximation of classes of periodic functions of several variables by nuclear operators. Matematičeskie zametki, Tome 47 (1990) no. 3, pp. 32-41. http://geodesic.mathdoc.fr/item/MZM_1990_47_3_a4/