Geodesic
A method of approximating by trigonometric polynomial functions of two variables satisfying a Lipschitz condition
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1963), pp. 135-136.

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@article{IVM_1963_3_a18,
     author = {P. I. Ruban and K. V. Krasil'nikov},
     title = {A method of approximating by trigonometric polynomial functions of two variables satisfying a {Lipschitz} condition},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {135--136},
     publisher = {mathdoc},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1963_3_a18/}
}
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P. I. Ruban; K. V. Krasil'nikov. A method of approximating by trigonometric polynomial functions of two variables satisfying a Lipschitz condition. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1963), pp. 135-136. http://geodesic.mathdoc.fr/item/IVM_1963_3_a18/