@article{ELMA_1959__14_140695,
     author = {H. Hadwiger},
     title = {Elementare {Begr\"undung} ausgew\"ahlter stetigkeitsgeometrischer {S\"atze} f\"ur {Kreis} und {Kugelfl\"ache.}},
     journal = {Elemente der Mathematik},
     pages = {49--60},
     publisher = {mathdoc},
     volume = {14},
     year = {1959},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1959__14_140695/}
}