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Discussiones Mathematicae - General Algebra and Applications > 2015 > 35 > 2 > 177-193
Fuzzy Sets and Systems > 2009 > 160 > 20 > 2979-2988
Czechoslovak Mathematical Journal > 2006 > 56 > 2 > 389-402
Fuzzy Sets and Systems > 2002 > 125 > 2 > 215-222