@article{ELMA_1959__14_140696,
     author = {H. Hadwiger},
     title = {Ungel\"oste {Probleme.}},
     journal = {Elemente der Mathematik},
     pages = {60--61},
     publisher = {mathdoc},
     volume = {14},
     year = {1959},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1959__14_140696/}
}