@article{GDZPPN002055503, title = {Abwickelbare Schiebfl\"achen in Rn.}, journal = {Commentarii mathematici Helvetici}, volume = {24}, year = {1950}, pages = {64-67}, zbl = {0036.11501}, url = {http://dml.mathdoc.fr/item/GDZPPN002055503} }
Pinl, M. Abwickelbare Schiebflächen in Rn.. Commentarii mathematici Helvetici, Tome 24 (1950) pp. 64-67. http://gdmltest.u-ga.fr/item/GDZPPN002055503/