%0 Journal Article %A Kikuchi, Masato %T Averaging Operators and Martingale Inequalities in Rearrangement Invariant Function Spaces %J Canadian mathematical bulletin %D 1999 %P 321-334 %V 42 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1999-038-7/ %R 10.4153/CMB-1999-038-7 %F 10_4153_CMB_1999_038_7