@article{1113318124, author = {Durante, Nicola and Olanda, Domenico}, title = {A characterization of the family of secant or external lines of an ovoid of PG$(3,q)$}, journal = {Bull. Belg. Math. Soc. Simon Stevin}, volume = {11}, number = {5}, year = {2005}, pages = { 1-4}, language = {en}, url = {http://dml.mathdoc.fr/item/1113318124} }
Durante, Nicola; Olanda, Domenico. A characterization of the family of secant or external lines of an ovoid of PG$(3,q)$. Bull. Belg. Math. Soc. Simon Stevin, Tome 11 (2005) no. 5, pp. 1-4. http://gdmltest.u-ga.fr/item/1113318124/