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Procedia Computer Science > 2015 > 60 > C > 27-36
Archive for Mathematical Logic > 2013 > 52 > 7-8 > 689-706
Fuzzy Sets and Systems > 2012 > 187 > 1 > 33-57
Algebra universalis > 2011 > 66 > 1-2 > 151-161
Discussiones Mathematicae - General Algebra and Applications > 2007 > 27 > 2 > 169-186