Cioabă SM. Bounds on the Turán Density of ${\rm PG}(3,2)$. Electron. J. Combin. [Internet]. 2004Mar.5 [cited 2026Apr.5];11(1):N3. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v11i1n3