@article{ELMA_1947__2_140456,
     author = {H. Hadwiger},
     title = {\"Uber eine symbolisch-topologische {Formel.}},
     journal = {Elemente der Mathematik},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {2},
     year = {1947},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1947__2_140456/}
}