@article{JRAM_1953__191_150238,
     author = {W. Blaschke},
     title = {Zur topologischen {Differentialgeometrie.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {153--157},
     publisher = {mathdoc},
     volume = {191},
     year = {1953},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1953__191_150238/}
}