%0 Journal Article %A Victor Shapiro %T Singular integrals and cardinal series %J Studia Mathematica %D 1972 %P 253-262 %V 44 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-44-3-253-262/ %R 10.4064/sm-44-3-253-262 %G en %F 10_4064_sm_44_3_253_262