@article{10_14708_wm_v48i2_332,
     author = {James D. Mitchel and Yann Peresse},
     title = {Sierpi\'nski{\textquoteright}s {Rank} for {Groups} and {Semigroups}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 209},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {2012},
     doi = {10.14708/wm.v48i2.332},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v48i2.332/}
}