@article{CMH_1944__17_138847,
     author = {Wilhelm Blaschke},
     title = {Zur {Bewegungsgeometrie} auf der {Kugel.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {80--82},
     publisher = {mathdoc},
     volume = {17},
     year = {1944},
     zbl = {0063.00450},
     url = {http://geodesic.mathdoc.fr/item/CMH_1944__17_138847/}
}