By Caselli G. P   Battini M.   in Applied Economics Letters

ISSN:1466-4291|7|11|699-702

Routledge Ltd‎(2000)‎

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By Otten H.   Wäckers F.   Battini M.   Dorn S.   in Animal Behaviour

ISSN:0003-3472|61|3|671-677

Elsevier‎(2001)‎

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