%0 Journal Article %A Miguel de Guzmán %T An inequality for the Hardy-Littlewood maximal operator with respect to a product of differentiation bases %J Studia Mathematica %D 1973 %P 185-194 %V 49 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-49-2-185-194/ %R 10.4064/sm-49-2-185-194 %G en %F 10_4064_sm_49_2_185_194