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2. Fuzzy closure operators;Bělohlávek;J. Math. Anal. Appl.,2001
3. Lattice type fuzzy order and closure operators in fuzzy ordered sets;Bělohlávek,2001
4. Fuzzy Relational Systems;Bělohlávek,2002
5. Concept lattices and order in fuzzy logic;Bělohlávek;Ann. Pure Appl. Log.,2004