Geodesic
The estimation of approximations of functions of two variables of Lipschitz class by trigonometric polynomials
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1971), pp. 49-62.

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@article{IVM_1971_12_a5,
     author = {G. P. Gubanov},
     title = {The estimation of approximations of functions of two variables of {Lipschitz} class by trigonometric polynomials},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {49--62},
     publisher = {mathdoc},
     number = {12},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1971_12_a5/}
}
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G. P. Gubanov. The estimation of approximations of functions of two variables of Lipschitz class by trigonometric polynomials. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1971), pp. 49-62. http://geodesic.mathdoc.fr/item/IVM_1971_12_a5/