@article{JRAM_1976__0286_0287_151782,
     author = {Josef Hoschek},
     title = {Globale {Invarianten} von {Raumkurven,} {Regelfl\"achen} und {Geradenkongruenzen} im einfach isotropen {Raum.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {205--212},
     publisher = {mathdoc},
     volume = {0286_0287},
     year = {1976},
     zbl = {0332.53003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__0286_0287_151782/}
}