Geodesic
The approximation of functions of several variables by trigonometric polynomials
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1977), pp. 50-54.

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@article{IVM_1977_6_a5,
     author = {G. Kh. Kirov and P. D. Proinov},
     title = {The approximation of functions of several variables by trigonometric polynomials},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {50--54},
     publisher = {mathdoc},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1977_6_a5/}
}
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G. Kh. Kirov; P. D. Proinov. The approximation of functions of several variables by trigonometric polynomials. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1977), pp. 50-54. http://geodesic.mathdoc.fr/item/IVM_1977_6_a5/