%0 Journal Article %A Adam Osękowski %T Two Inequalities for the First Moments of a Martingale, its Square Function and its Maximal Function %J Bulletin of the Polish Academy of Sciences. Mathematics %D 2005 %P 441-449 %V 53 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ba53-4-9/ %R 10.4064/ba53-4-9 %G en %F 10_4064_ba53_4_9