@article{01669225,
title = {A family of conics and three special ruled surfaces.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {42},
year = {2001},
pages = {531-545},
zbl = {0998.51014},
language = {en},
url = {http://dml.mathdoc.fr/item/01669225}
}
Schröcker, Hans-Peter. A family of conics and three special ruled surfaces.. Beiträge zur Algebra und Geometrie, Tome 42 (2001) pp. 531-545. http://gdmltest.u-ga.fr/item/01669225/