On the Turán number for the hexagon

Zoltan Füredi, Assaf Naor, Jacques Verstraëte
2006 Advances in Mathematics  
A long-standing conjecture of Erdős and Simonovits is that ex(n, C 2k
doi:10.1016/j.aim.2005.04.011 fatcat:2v4o6cnb7vajngym3hg4kiryjy