%0 Journal Article %A A. Cordoba %A C. Fefferman %T A weighted norm inequality for singular integrals %J Studia Mathematica %D 1976 %P 97-101 %V 57 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-57-1-97-101/ %R 10.4064/sm-57-1-97-101 %G en %F 10_4064_sm_57_1_97_101