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Author Title Year Publication Serial Volume Pages
Pepperberg, I.M.; Brezinsky, M.V. Acquisition of a relative class concept by an African gray parrot (Psittacus erithacus): discriminations based on relative size 1991 Journal of Comparative Psychology 3610 105 286-294
Cheney, D.L.; Seyfarth, R.M. The representation of social relations by monkeys 1990 Cognition 702 37 167-196
Cheney, D.L.; Seyfarth, R.M.; Silk, J.B. The responses of female baboons (Papio cynocephalus ursinus) to anomalous social interactions: evidence for causal reasoning? 1995 Journal of comparative psychology (Washington, D.C. : 1983) 348 109 134-141
Parker, S.T. A general model for the adaptive function of self-knowledge in animals and humans 1997 Consciousness and Cognition 4160 6 75-86