@article{ELMA_1955__10_140636,
     author = {H. Hadwiger},
     title = {Ungel\"oste {Probleme.}},
     journal = {Elemente der Mathematik},
     pages = {130--132},
     publisher = {mathdoc},
     volume = {10},
     year = {1955},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1955__10_140636/}
}