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ISSN:0003-3472|54|4|873-877

Elsevier‎(1997)‎

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By Siitari H.   Honkavaara J.   Huhta E.   Viitala J.   in Animal Behaviour

ISSN:0003-3472|63|1|97-102

Elsevier‎(2002)‎

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