@article{IVM_1969_5_a3,
     author = {G. P. Gubanov},
     title = {The approximation of continuous periodic functions of two variables by trigonometric polynomials},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {30--34},
     publisher = {mathdoc},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_5_a3/}
}