%0 Journal Article %A Kórus, Péter %T Necessary and sufficient conditions for the $L^1$-convergence of double Fourier series %J Czechoslovak Mathematical Journal %D 2018 %P 987-996 %V 68 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2018.0043-17/ %R 10.21136/CMJ.2018.0043-17 %G en %F 10_21136_CMJ_2018_0043_17