Geodesic
Approximation of differentiable periodic functions of two variables by Fourier sums
Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 114-115.

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@article{TRSPY_1987_180_a62,
     author = {P. V. Zaderej},
     title = {Approximation of differentiable periodic functions of two variables by {Fourier} sums},
     journal = {Informatics and Automation},
     pages = {114--115},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a62/}
}
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P. V. Zaderej. Approximation of differentiable periodic functions of two variables by Fourier sums. Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 114-115. http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a62/