%0 Journal Article %A S. Gładysz %A Edward Marczewski %A Czesław Ryll-Nardzewski %T Concerning distances of sets and distances of functions %J Colloquium Mathematicum %D 1961 %P 71-75 %V 8 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-8-1-71-75/ %R 10.4064/cm-8-1-71-75 %G en %F 10_4064_cm_8_1_71_75