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Fuzzy Sets and Systems > 2010 > 161 > 9 > 1325-1342
Fuzzy Sets and Systems > 2008 > 159 > 19 > 2469-2487
Algebra universalis > 2005 > 52 > 4 > 527-540
Fuzzy Sets and Systems > 2010 > 161 > 9 > 1325-1342
Fuzzy Sets and Systems > 2008 > 159 > 19 > 2469-2487
Algebra universalis > 2005 > 52 > 4 > 527-540