By Koivula M.   Korpimaki E.   Viitala J.   in Animal Behaviour

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

Elsevier‎(1997)‎

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By Korpimaki E.   Lahti K.   May C.A.   Parkin D.T.   Powell G.B.   Tolonen P.   Wetton J.H.   in Animal Behaviour

ISSN:0003-3472|51|4|945-955

Elsevier‎(1996)‎

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