@article{ELMA_1960__15_140706,
     author = {H. Hadwiger},
     title = {Ungel\"oste {Probleme.}},
     journal = {Elemente der Mathematik},
     pages = {8--9},
     publisher = {mathdoc},
     volume = {15},
     year = {1960},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1960__15_140706/}
}