@article{10_14708_wm_v33i01_4680,
     author = {W. A. Woyczy\'oski},
     title = {Szukaj\k{a}c {Birnbauma}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 137--154},
     publisher = {mathdoc},
     volume = {33},
     number = {01},
     year = {1997},
     doi = {10.14708/wm.v33i01.4680},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v33i01.4680/}
}