%0 Journal Article %A Krzysztof Kołodziejczyk %T On starshapedness of the union of closed sets in $R^n$ %J Colloquium Mathematicum %D 1987 %P 193-197 %V 53 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-53-2-193-197/ %R 10.4064/cm-53-2-193-197 %G en %F 10_4064_cm_53_2_193_197