@article{MZM_2002_71_1_a9,
     author = {A. S. Romanyuk},
     title = {Approximation of {Classes} of {Periodic} {Functions} in {Several} {Variables}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {109--121},
     publisher = {mathdoc},
     volume = {71},
     number = {1},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2002_71_1_a9/}
}