@article{JRAM_1927__156_149599,
     author = {Julius Wellstein},
     title = {Fl\"achen isotroper {Drehungen} und {Schraubungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {149--163},
     publisher = {mathdoc},
     volume = {156},
     year = {1927},
     zbl = {53.0670.04},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1927__156_149599/}
}