Mathematical aspects of fuzzy sets / guest ed.: Erich Peter KlementApplications of category theory to fuzzy subsets / ed. by Stephen Ernest Rodabaugh, Erich Peter Klement and Ulrich HöhleTriangular norm-based measures and games with fuzzy coalitions / by Dan Butnariu and Erich Peter KlementNon-classical logics and their applications to fuzzy subsets : a handbook of the mathematical foundations of fuzzy set theory / ed. by Ulrich Höhle and Erich Peter KlementTopological and algebraic structures in fuzzy sets : a handbook of recent developments in the mathematics of fuzzy sets / ed. by Stephen Ernest Rodabaugh and Erich Peter KlementLogical, algebraic, analytic, and probabilistic aspects of triangular norms / ed. by Erich Peter Klement, Radko Mesiar