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@article{MZM_1983_33_4_a3, author = {M. Zh. Grigoryan}, title = {Convergence in the metric of $L_p$, $0<p<1$, of spherical partial sums of double {Fourier} series}, journal = {Matemati\v{c}eskie zametki}, pages = {517--528}, publisher = {mathdoc}, volume = {33}, number = {4}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1983_33_4_a3/} }
M. Zh. Grigoryan. Convergence in the metric of $L_p$, $0