@article{MZ_1922__15_167725,
     author = {W. Blaschke},
     title = {Differentialgeometrie der geradlinigen {Fl\"achen} im elliptischen {Raum}},
     journal = {Mathematische Zeitschrift},
     pages = {309--320},
     publisher = {mathdoc},
     volume = {15},
     year = {1922},
     zbl = {48.0806.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1922__15_167725/}
}