Geodesic
Asymptotic formulas for the deviation of linear summation methods of double Fourier series
Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms, Tome 80 (1978), pp. 189-196 Cet article a éte moissonné depuis la source Math-Net.Ru

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The article investigates a wide class of trigonometric polynomial approximations to periodic functions of two variables which includes, in particular, Fejer and Riesz averages. Asymptotic formulas for the deviation of these methods in the uniform metric are derived. 
@article{ZNSL_1978_80_a10,
     author = {M. A. Skopina},
     title = {Asymptotic formulas for the deviation of linear summation methods of double {Fourier} series},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {189--196},
     year = {1978},
     volume = {80},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_80_a10/}
}
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M. A. Skopina. Asymptotic formulas for the deviation of linear summation methods of double Fourier series. Zapiski Nauchnykh Seminarov POMI, Computational methods and algorithms, Tome 80 (1978), pp. 189-196. http://geodesic.mathdoc.fr/item/ZNSL_1978_80_a10/