By Härdling R.   in Journal of Theoretical Biology

ISSN:0022-5193|196|2|163-167

Academic Press‎(1999)‎

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By Jormalainen V.   Merilaita S.   Härdling R.   in Animal Behaviour

ISSN:0003-3472|60|1|85-93

Elsevier‎(2000)‎

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