By Naguib M.   Klump G.M.   Hillmann E.   Grießmann B.   Teige T.   in Animal Behaviour

ISSN:0003-3472|59|4|715-721

Elsevier‎(2000)‎

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By Hillmann E   Mayer C   Schrader L   in Animal Welfare

ISSN:0962-7286|13|3|329-335

Universities Federation for Animal Welfare‎(2004)‎

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