Geodesic
The approximation of continuous periodic functions of two variables by trigonometric polynomials
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1969), pp. 30-34.

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@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/}
}
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%G ru
%F IVM_1969_5_a3
G. P. Gubanov. The approximation of continuous periodic functions of two variables by trigonometric polynomials. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1969), pp. 30-34. http://geodesic.mathdoc.fr/item/IVM_1969_5_a3/