@article{JRAM_1935__173_149935,
     author = {Wolfgang Franz},
     title = {\"Uber die {Torsion} einer {\"Uberdeckung.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {245--254},
     publisher = {mathdoc},
     volume = {173},
     year = {1935},
     zbl = {0012.12702},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1935__173_149935/}
}