Ultrasonic vocalizations of rats (Rattus norvegicus) during mating, play, and aggression: Behavioral concomitants, relationship to reward, and self-administration of playback..Journal of comparative psychology (Washington, D.C. : 1983) - Tập 122 Số 4 - Trang 357-367
Jeffrey Burgdorf, Roger A. Kroes, Joseph R. Moskal, James G. Pfaus, Stefan M. Brudzyński, Jaak Panksepp