%0 Journal Article %A . . %T Zadania %J WiadomoĊ›ci Matematyczne %D 1978 %P 83-84 %V 21 %N 01 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14708/wm.v21i01.3574/ %R 10.14708/wm.v21i01.3574 %G pl %F 10_14708_wm_v21i01_3574