By Nahak C.   Nanda S.   in European Journal of Operational Research

ISSN:0377-2217|122|1|145-150

Elsevier‎(2000)‎

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By Mandal P.   Nahak C.   in International Journal of Mathematics in Operational Research

ISSN:1757-5850|5|1|121-143

Inderscience Publishers‎(2013)‎

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