@article{ELMA_1954__9_140612,
     author = {H. Hadwiger},
     title = {Ungel\"oste {Probleme.}},
     journal = {Elemente der Mathematik},
     pages = {133--134},
     publisher = {mathdoc},
     volume = {9},
     year = {1954},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1954__9_140612/}
}