@article{MAN_1969__183_161880,
     author = {H. Brauner},
     title = {Die windschiefen {Kegelschnittfl\"achen.}},
     journal = {Mathematische Annalen},
     pages = {33--44},
     publisher = {mathdoc},
     volume = {183},
     year = {1969},
     zbl = {0181.48602},
     url = {http://geodesic.mathdoc.fr/item/MAN_1969__183_161880/}
}