By You K. H.   Kwak S. W.   in International Journal of Systems Science

ISSN:1464-5319|37|3|173-180

Taylor & Francis Ltd‎(2006)‎

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By Choi B.-J.   Kwak S.-W.   Kim B.K.   in Fuzzy Sets and Systems

ISSN:0165-0114|106|3|299-308

Elsevier‎(1999)‎

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