@article{BAG_1988__26_138394,
     author = {H. Pottmann},
     title = {Globale {Eigenschaften} der {Pseudostriktionslinien} einer {Regelfl\"ache}},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {101--112},
     publisher = {mathdoc},
     volume = {26},
     year = {1988},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/BAG_1988__26_138394/}
}