@article{MAN_1968__179_161782,
     author = {J. HOSCHEK},
     title = {Eine {Verallgemeinerung} der {B\"oschungsfl\"achen.}},
     journal = {Mathematische Annalen},
     pages = {275--284},
     publisher = {mathdoc},
     volume = {179},
     year = {1968},
     zbl = {0157.28003},
     url = {http://geodesic.mathdoc.fr/item/MAN_1968__179_161782/}
}