@article{BAG_1990__30_138461,
     author = {U. STERZ and K. DRECHSLER},
     title = {Completion of the variety of conics with respect to contact conditions {II}},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {117--132},
     year = {1990},
     volume = {30},
     zbl = {0758.14019},
     url = {http://geodesic.mathdoc.fr/item/BAG_1990__30_138461/}
}