Cruz, Fabio C., Quadros, Isabel M., Hogenelst, Koen, Planeta, Cleopatra S., Miczek, Klaus A., & Planeta, Miczek K.A. (2011). Social defeat stress in rats: escalation of cocaine and "speedball" binge self-administration, but not heroin. Psychopharmacology (Berl).
Hagewoud, Roelina, Havekes PhD, Robbert, Tiba PhD, Paula A., Novati, Arianna, Hogenelst, Koen, Weinreder, Pim, Zee PhD, Eddy A.van der, & Meerlo PhD, Peter (2010). Coping with sleep deprivation: shifts in regional brain activity and learning strategy. Sleep, (11).