@article{10_14708_wm_v10i1_2202,
     author = {J. {\L}ukaszewicz},
     title = {Julian {Perkal} (1913-1965)},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 29--36},
     year = {1967},
     volume = {10},
     number = {1},
     doi = {10.14708/wm.v10i1.2202},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v10i1.2202/}
}