@article{BAG_1991__31_138480,
     author = {U. STERZ and K. DRECHSLER},
     title = {The intersection rings of the conic varieties},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {143--162},
     publisher = {mathdoc},
     volume = {31},
     year = {1991},
     zbl = {0758.14036},
     url = {http://geodesic.mathdoc.fr/item/BAG_1991__31_138480/}
}