By James MP   Neilson FJA   Stewart WJ   in New Zealand Veterinary Journal

ISSN:1176-0710|23|1-2|9-12

Taylor & Francis Ltd‎(1975)‎

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By Stewart W.J.   Atif K.   Plateau B.   in European Journal of Operational Research

ISSN:0377-2217|86|3|503-525

Elsevier‎(1995)‎

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