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Fuzzy Sets and Systems > 2012 > 199 > Complete > 121-129
Algebra universalis > 2010 > 64 > 1-2 > 187-202
Fuzzy Sets and Systems > 2002 > 125 > 2 > 209-214
Fuzzy Sets and Systems > 2002 > 125 > 2 > 191-200
Fuzzy Sets and Systems > 2000 > 112 > 2 > 349-353
Fuzzy Sets and Systems > 1995 > 74 > 3 > 371-379