@article{GDZPPN002418088, title = {Verallgemeinerte Regelfl\"achen.}, journal = {Mathematische Zeitschrift}, volume = {147}, year = {1976}, pages = {261-272}, zbl = {0331.53011}, url = {http://dml.mathdoc.fr/item/GDZPPN002418088} }
Giering, Oswald; Frank, Hubert. Verallgemeinerte Regelflächen.. Mathematische Zeitschrift, Tome 147 (1976) pp. 261-272. http://gdmltest.u-ga.fr/item/GDZPPN002418088/