@article{10_4064_am_5_3_289_297,
     author = {W. Szwarc},
     title = {O pewnym macierzowym zagadnieniu {Perkala}},
     journal = {Applicationes Mathematicae},
     pages = {289--297},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1960},
     doi = {10.4064/am-5-3-289-297},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-5-3-289-297/}
}