By Dula J.H.   in European Journal of Operational Research

ISSN:0377-2217|101|1|51-64

Elsevier‎(1997)‎

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By Dula J.H.   Helgason R.V.   in European Journal of Operational Research

ISSN:0377-2217|92|2|352-367

Elsevier‎(1996)‎

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