Geodesic
On convergence of Riesz spherical means of multiple Fourier series
Sbornik. Mathematics, Tome 25 (1975) no. 2, pp. 177-197

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An $N$-dimensional analog is proved of a theorem of Plessner and Ul'yanov on equivalent conditions for convergence of certain series and integrals. There is obtained from it a sufficient condition on the quadratic modulus of continuity of a periodic function of $N\geqslant2$ variables ensuring the a.e. convergence of the spherical sums of its Fourier series. A two-dimensional analog of a theorem of Luzin and Denjoy and an $N$-dimensional analog of the Dini–Lipschitz criterion are proved. A necessary and sufficient condition on a function $\Phi(u)$ is derived ensuring the pointwise convergence of the Riesz spherical means of critical order of multiple Fourier series of functions of bounded $\Phi$-variation. Bibliography: 33 titles. 
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     author = {B. I. Golubov},
     title = {On convergence of {Riesz} spherical means of multiple {Fourier} series},
     journal = {Sbornik. Mathematics},
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     volume = {25},
     number = {2},
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B. I. Golubov. On convergence of Riesz spherical means of multiple Fourier series. Sbornik. Mathematics, Tome 25 (1975) no. 2, pp. 177-197. http://geodesic.mathdoc.fr/item/SM_1975_25_2_a1/