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  Author (up) Title Year Publication Serial Volume Pages Links
Zentall, T.R.; Hogan, D.E.. Same/different concept learning in the pigeon: the effect of negative instances and prior adaptation to transfer stimuli 1978 271 30 177-186 details   doi
Zentall, T.R; Hogan, D.E. Key pecking in pigeons produced by pairing keylight with inaccessible grain 1975 273 23 199-206 details   doi
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