@article{DAN_1978_240_2_a7,
     author = {R. M. Trigub},
     title = {Summability of multiple {Fourier} series and the approximation of functions on the torus by polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {276--279},
     publisher = {mathdoc},
     volume = {240},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_240_2_a7/}
}