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32. "Supernormality" in a learning situation. Hogan JA, Kruijt JP, Frijlink JH. Z Tierpsychol; 1975 Sep; 38(2):212-8. PubMed ID: 1189653 [Abstract] [Full Text] [Related]
33. Investigations of a mirror-image transfer effect in pigeons. Thomas DR, Klipec W, Lyons J. J Exp Anal Behav; 1966 Sep; 9(5):567-71. PubMed ID: 5964513 [Abstract] [Full Text] [Related]