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@article{MZ_1976__150_172421, author = {Oswald Giering and Hubert Frank}, title = {Verallgemeinerte {Regelfl\"achen.}}, journal = {Mathematische Zeitschrift}, pages = {261--272}, publisher = {mathdoc}, volume = {150}, year = {1976}, zbl = {0331.53011}, url = {http://geodesic.mathdoc.fr/item/MZ_1976__150_172421/} }
Oswald Giering; Hubert Frank. Verallgemeinerte Regelflächen.. Mathematische Zeitschrift, Tome 150 (1976), pp. 261-272. http://geodesic.mathdoc.fr/item/MZ_1976__150_172421/