Panksepp, J; Burgdorf, J. (October 2000). "50k-Hz chirping (laughter?) in response to conditioned and unconditioned tickle-induced reward in rats: effects of social housing and genetic variables". Behavioral Brain Research. 115 (1): 25–38. doi:10.1016/s0166-4328(00)00238-2. PMID10996405. S2CID29323849.
Panksepp, J; Burgdorf, J. (October 2000). "50k-Hz chirping (laughter?) in response to conditioned and unconditioned tickle-induced reward in rats: effects of social housing and genetic variables". Behavioral Brain Research. 115 (1): 25–38. doi:10.1016/s0166-4328(00)00238-2. PMID10996405. S2CID29323849.
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Panksepp, J; Burgdorf, J. (October 2000). "50k-Hz chirping (laughter?) in response to conditioned and unconditioned tickle-induced reward in rats: effects of social housing and genetic variables". Behavioral Brain Research. 115 (1): 25–38. doi:10.1016/s0166-4328(00)00238-2. PMID10996405. S2CID29323849.