@article{02107508, title = {Bounds on the Tur\'an density of PG(3, 2).}, journal = {The Electronic Journal of Combinatorics [electronic only]}, volume = {11}, year = {2004}, zbl = {1053.05066}, language = {en}, url = {http://dml.mathdoc.fr/item/02107508} }
Cioabă, Sebastian M. Bounds on the Turán density of PG(3, 2).. The Electronic Journal of Combinatorics [electronic only], Tome 11 (2004) . http://gdmltest.u-ga.fr/item/02107508/