@article{GDZPPN00208404X, title = {Derivation of Flocks of Quadratic Cones.}, journal = {Forum mathematicum}, volume = {2}, year = {1990}, pages = {163-174}, zbl = {0692.51006}, url = {http://dml.mathdoc.fr/item/GDZPPN00208404X} }
Thas, J.A.; Bader, Laura; Lunardo, G. Derivation of Flocks of Quadratic Cones.. Forum mathematicum, Tome 2 (1990) pp. 163-174. http://gdmltest.u-ga.fr/item/GDZPPN00208404X/