%0 Journal Article %A D.Z. Djokovic %T A Problem of Mapping a Finite Set into a Set of Positive Measure %J Commentarii mathematici Helvetici %D 1971 %P 137 %V 46 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/CMH_1971__46_139468/ %G un %F CMH_1971__46_139468