Nadia Creignou Hervé Daudé Uwe Egly Raphaël Rossignol New Results on the Phase Transition for Random Quantified Boolean Formulas. 34-47 2008 SAT http://dx.doi.org/10.1007/978-3-540-79719-7_5 conf/sat/2008 db/conf/sat/sat2008.html#CreignouDER08