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ISSN:1480-3283|81|3|504-514

NRC Research Press‎(2003)‎

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By Robertson G.J.   Cooke F.   Goudie R.I.A.N.   Boyd W.S.E.A.N.   in Animal Behaviour

ISSN:0003-3472|55|6|1677-1684

Elsevier‎(1998)‎

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