%0 Journal Article %A Adam Os/ekowski %T Sharp Norm Inequalities for Martingales and their Differential Subordinates %J Bulletin of the Polish Academy of Sciences. Mathematics %D 2007 %P 373-385 %V 55 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ba55-4-9/ %R 10.4064/ba55-4-9 %G en %F 10_4064_ba55_4_9