@article{10_14708_cm_v47i1_5239,
     author = {Danuta Borowska and Jerzy Grzybowski},
     title = {Minkowski difference and {Sallee} elements in an ordered semigroup},
     journal = {Commentationes Mathematicae},
     pages = { 77--83},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {2007},
     doi = {10.14708/cm.v47i1.5239},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v47i1.5239/}
}