@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/}
}