By Kharoufeh J.P.   in Operations Research Letters

ISSN:0167-6377|32|2|196-196

Elsevier‎(2004)‎

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By Kharoufeh J. P.   Chandra M. J.   in International Journal of Production Research

ISSN:1366-588X|40|2|337-352

Taylor & Francis Ltd‎(2002)‎

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