%0 Journal Article %A A. Calderón %A A. Zygmund %T Addendum to a paper "On singular integrals" %J Studia Mathematica %D 1973 %P 297-299 %V 46 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-46-3-297-299/ %R 10.4064/sm-46-3-297-299 %G en %F 10_4064_sm_46_3_297_299