The approximation of continuous functions of two variables by trigonometric polynomials
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1968), pp. 26-34.

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@article{IVM_1968_8_a3,
     author = {G. P. Gubanov},
     title = {The approximation of continuous functions of two variables by trigonometric polynomials},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {26--34},
     publisher = {mathdoc},
     number = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_8_a3/}
}
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G. P. Gubanov. The approximation of continuous functions of two variables by trigonometric polynomials. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1968), pp. 26-34. http://geodesic.mathdoc.fr/item/IVM_1968_8_a3/