Geodesic
On the divergence of triangular and eccentric spherical sums of double Fourier series
Sbornik. Mathematics, Tome 207 (2016) no. 1, pp. 65-84

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We construct a continuous function on the torus with almost everywhere divergent triangular sums of double Fourier series. We also prove an analogous theorem for eccentric spherical sums. Bibliography: 14 titles.
Keywords: divergent triangular sums, double Fourier series. 
G. A. Karagulyan. On the divergence of triangular and eccentric spherical sums of double Fourier series. Sbornik. Mathematics, Tome 207 (2016) no. 1, pp. 65-84. http://geodesic.mathdoc.fr/item/SM_2016_207_1_a2/
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