On starshapedness of the union of closed sets in $R^n$

Instytut Matematyczny Polskiej Akademii Nauk / Institute of Mathematics / Publishing house / Journals and Serials / Colloquium Mathematicum / All issues

Krzysztof Kołodziejczyk Colloquium Mathematicum 53 (1987), 193-197 DOI: 10.4064/cm-53-2-193-197