%0 Journal Article %A Richard Gundy %T On the class LlogL, martingales, and singular integrals %J Studia Mathematica %D 1969 %P 109-118 %V 33 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-33-1-109-118/ %R 10.4064/sm-33-1-109-118 %G en %F 10_4064_sm_33_1_109_118