By Hill SP   in Animal Welfare

ISSN:0962-7286|18|2|123-127

Universities Federation for Animal Welfare‎(2009)‎

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By Achuthan N.R.   Caccetta L.   Hill S.P.   in European Journal of Operational Research

ISSN:0377-2217|91|3|573-586

Elsevier‎(1996)‎

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