%0 Journal Article %A Loukas Grafakos %A Stephen Montgomery-Smith %A Olexei Motrunich %T A sharp estimate for the Hardy-Littlewood maximal function %J Studia Mathematica %D 1999 %P 57-67 %V 134 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-134-1-57-67/ %R 10.4064/sm-134-1-57-67 %G en %F 10_4064_sm_134_1_57_67