By Healy A   Nijman V   in Animal Welfare

ISSN:0962-7286|23|3|353-360

Universities Federation for Animal Welfare‎(2014)‎

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By Nijman V.   Nekaris K.   in International Journal of Primatology

ISSN:0164-0291|31|6|1147-1160

Springer Publishing Company ‎(2010)‎

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