@article{DAN_1960_132_5_a2,
     author = {K. I. Babenko},
     title = {Approximation of a certain class of periodical functions of many variables by trigonometric polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {982--985},
     publisher = {mathdoc},
     volume = {132},
     number = {5},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_132_5_a2/}
}