@article{10_4064_ba57_1_9,
     author = {Adam Os/ekowski},
     title = {Weak {Type} {Inequality} for the {Square} {Function} of a {Nonnegative} {Submartingale}},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {81--89},
     publisher = {mathdoc},
     volume = {57},
     number = {1},
     year = {2009},
     doi = {10.4064/ba57-1-9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba57-1-9/}
}