@article{CMH_1942__15_138796,
     author = {H. Hadwiger},
     title = {\"Uber {Parallelinvarianten} bei {Eik\"orpern.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {33--35},
     year = {1942},
     volume = {15},
     zbl = {68.0461.03},
     url = {http://geodesic.mathdoc.fr/item/CMH_1942__15_138796/}
}