@article{ELMA_1949__4_140509,
     author = {W. Prokop},
     title = {Zum {Drallsatz} f\"ur den starren {K\"orper.}},
     journal = {Elemente der Mathematik},
     pages = {56--61},
     year = {1949},
     volume = {4},
     zbl = {0033.08501},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1949__4_140509/}
}