By Wootton R.J.   in Trends in Ecology and Evolution

ISSN:0169-5347|10|7|302-303

Elsevier‎(1995)‎

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By Wootton R.J.   in Netherlands Journal of Zoology

ISSN:1568-542X|42|2-3|291-303

Brill‎(1991)‎

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By Held S D E   Turner R J   Wootton R J   in Animal Welfare

ISSN:0962-7286|10|4|437-443

Universities Federation for Animal Welfare‎(2001)‎

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