@article{JRAM_1933__169_149854,
     author = {Otto Haupt},
     title = {Zur {Differentialgeometrie} der {Kurven} und {Fl\"achen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {177--185},
     publisher = {mathdoc},
     volume = {169},
     year = {1933},
     zbl = {0006.32206},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1933__169_149854/}
}