@article{JRAM_1959__202_150410,
     author = {Walter O. Vogel},
     title = {Regelfl\"achen im isotropen {Raum.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {196--214},
     publisher = {mathdoc},
     volume = {202},
     year = {1959},
     zbl = {0092.14408},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1959__202_150410/}
}