On approximation of functions of two variables by generalized polynomials
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 77-78.

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@article{TM_1987_180_a39,
     author = {S. B. Vakarchuk},
     title = {On approximation of functions of two variables by generalized polynomials},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {77--78},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a39/}
}
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S. B. Vakarchuk. On approximation of functions of two variables by generalized polynomials. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 77-78. http://geodesic.mathdoc.fr/item/TM_1987_180_a39/