@article{10_4064_sm_111_2_187_194,
     author = {Xiang-Qian Chang},
     title = {Some {Sawyer} type inequalities for martingales},
     journal = {Studia Mathematica},
     pages = {187--194},
     publisher = {mathdoc},
     volume = {111},
     number = {2},
     year = {1994},
     doi = {10.4064/sm-111-2-187-194},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-111-2-187-194/}
}