Dose-dependent differences in short ultrasonic vocalizations emitted by rats during cocaine self-administration.
Barker DJ, Root DH, Ma S, Jha S, Megehee L, Pawlak AP, West MO. Dose-dependent differences in short ultrasonic vocalizations emitted by rats during cocaine self-administration. Psychopharmacology (Berl). 2010 Sep; 211(4):435-42.