%0 Journal Article %A Calixto Calderón %T On a singular integral %J Studia Mathematica %D 1979 %P 313-335 %V 65 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-65-3-313-335/ %R 10.4064/sm-65-3-313-335 %G en %F 10_4064_sm_65_3_313_335