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European Journal of Operational Research > 1998 > 109 > 2 > 342-361
Fuzzy Sets and Systems > 1997 > 89 > 1 > 61-68
European Journal of Operational Research > 1998 > 109 > 2 > 342-361
Fuzzy Sets and Systems > 1997 > 89 > 1 > 61-68