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nature.com
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WIMPENNY, Joanna H., Weir, AAS, Clayton, L, Rutz, C, Kacelnik, A Cognitive Processes Associated with Sequential Tool Use in New Caledonian Crows. PLOS One, August 2009. Dostupné online [cit. 2013-02-19]. DOI: 10.1371/journal.pone.0006471. PMID e6471.
sciencedaily.com
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sciencedirect.com
TAYLOR, Alex H., Hunt, GR, Holzhaider, JC, Gray, RD Spontaneous metatool use by New Caledonian crows. Current Biology, september 2007, s. 1504–1507. Dostupné online [cit. 2013-02-19]. DOI: 10.1016/j.cub.2007.07.057.