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Algebra universalis > 2018 > 79 > 4 > 1-28
Mathematica Slovaca > 2011 > 61 > 6 > 859-870
Fuzzy Sets and Systems > 2010 > 161 > 9 > 1325-1342
Algebra universalis > 2007 > 57 > 1 > 63-73
Fundamenta Informaticae > 2004 > Vol. 60, nr 1-4 > 401--415