@article{CMH_1945__18_138870,
     author = {H. Hadwiger},
     title = {Die erweiterten {Steinerschen} {Formeln} f\"ur ebene und sph\"arische {Bereiche.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {59--72},
     publisher = {mathdoc},
     volume = {18},
     year = {1945},
     zbl = {0063.01850},
     url = {http://geodesic.mathdoc.fr/item/CMH_1945__18_138870/}
}