@article{10_14708_wm_v15i1_921,
     author = {B. M. Schein and A. Wiweger},
     title = {Jak dzieli\'c przez zbi\'or pusty?},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 13--15},
     year = {1972},
     volume = {15},
     number = {1},
     doi = {10.14708/wm.v15i1.921},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v15i1.921/}
}