CZ:Ref:DOI:10.1007/s10329-008-0117-y
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Wich, Serge A.; Karyl B. Swartz & Madeleine E. Hardus et al. (2009), "A case of spontaneous acquisition of a human sound by an orangutan", Primates: in press, DOI:10.1007/s10329-008-0117-y [e]