%0 Journal Article %A A. Cianchi %A %A %A %T A sharp rearrangement inequality for the fractional maximal operator %J Studia Mathematica %D 2000 %P 277-284 %V 138 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-138-3-277-284/ %R 10.4064/sm-138-3-277-284 %G en %F 10_4064_sm_138_3_277_284