Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MM2_1971__5_154077, author = {Josef Hoschek}, title = {Scheitels\"atze f\"ur {Regelfl\"achen.}}, journal = {Manuscripta mathematica}, pages = {309--322}, publisher = {mathdoc}, volume = {5}, year = {1971}, zbl = {0223.53010}, url = {http://geodesic.mathdoc.fr/item/MM2_1971__5_154077/} }
Josef Hoschek. Scheitelsätze für Regelflächen.. Manuscripta mathematica, Tome 5 (1971), pp. 309-322. http://geodesic.mathdoc.fr/item/MM2_1971__5_154077/