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2. Development of Species Identification in Birds: An Inquiry into the Prenatal Determinants of Perception;Gottlieb,1971
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4. Effects of deafening on the development of nestling and juvenile vocalizations in budgerigars (Melopsittacus undulatus);Heaton;Journal of Comparative Psychology,1999
5. On the nature of fear;Hebb;Psychological Review,1946