Effects of drugs and drug combinations in pigeons trained to discriminate among pentobarbital, dizocilpine, a combination of these drugs, and saline.
McMillan DE, Wessinger WD, Li M. Effects of drugs and drug combinations in pigeons trained to discriminate among pentobarbital, dizocilpine, a combination of these drugs, and saline. J Exp Anal Behav. 2009 Nov; 92(3):387-412.