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Commentationes Mathematicae > 2015 > Vol 55, No. 2 > 163--169
Commentationes Mathematicae > 2015 > 55 > 2
Information Sciences > 2014 > 257 > Complete > 388-399
IEEE Transactions on Fuzzy Systems > 2006 > 14 > 2 > 180 - 190
Fuzzy Sets and Systems > 2005 > 153 > 2 > 297-299
Fuzzy Sets and Systems > 1999 > 104 > 1 > 85-96