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ISSN:0254-5330|108|1-4|55-74

Springer Publishing Company ‎(2001)‎

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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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