%0 Journal Article %A . . %T Zadania %J WiadomoĊ›ci Matematyczne %D 1975 %P 195-197 %V 19 %N 02 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14708/wm.v19i02.3509/ %R 10.14708/wm.v19i02.3509 %G pl %F 10_14708_wm_v19i02_3509