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Elsevier‎(1998)‎

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By Negro J.J.   Villarroel M.   Tella J.L.   Kuhnlein U.   Hiraldo F.   Donazar J.A.   Bird D.M.   in Animal Behaviour

ISSN:0003-3472|51|4|935-943

Elsevier‎(1996)‎

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