By Sakawa M.   Nishizaki I.   Hitaka M.   in Fuzzy Sets and Systems

ISSN:0165-0114|117|1|95-111

Elsevier‎(2001)‎

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By Sakawa M.   Nishizaki I.   Hitaka M.   in European Journal of Operational Research

ISSN:0377-2217|114|3|580-588

Elsevier‎(1999)‎

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