By Kalas J.A.   Steinnes E.   Lierhagen S.   in Environmental Pollution

ISSN:0269-7491|107|1|21-29

Elsevier‎(2000)‎

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By Fiske P.   Kalas J.A.   Saether S.A.   in Animal Behaviour

ISSN:0003-3472|51|6|1355-1362

Elsevier‎(1996)‎

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