@article{JDM_1929__38_145834,
     author = {Wilhelm Blaschke},
     title = {\"Uber topologische {Fragen} der {Differentialgeometrie.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {193--205},
     publisher = {mathdoc},
     volume = {38},
     year = {1929},
     zbl = {55.0390.12},
     url = {http://geodesic.mathdoc.fr/item/JDM_1929__38_145834/}
}