@article{MZ_1920__6_167559,
     author = {W., Blaschke},
     title = {Frenets {Formeln} f\"ur den {Baum} von {Riemann}},
     journal = {Mathematische Zeitschrift},
     pages = {94--99},
     publisher = {mathdoc},
     volume = {6},
     year = {1920},
     zbl = {47.0694.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1920__6_167559/}
}