@article{10_4064_cm_53_2_193_197,
     author = {Krzysztof Ko{\l}odziejczyk},
     title = {On starshapedness of the union of closed sets in $R^n$},
     journal = {Colloquium Mathematicum},
     pages = {193--197},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1987},
     doi = {10.4064/cm-53-2-193-197},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-53-2-193-197/}
}