1. Dependency structures of data base relationships;Ward Armstrong,1974
2. Infinite-valued Gödel logics with 0-1 projections and relativizations;Baaz,1996
3. Special properties, closures and interiors of crisp and fuzzy relations;Bandler;Fuzzy Sets Syst.,1988
4. Fuzzy closure operators;Belohlavek;J. Math. Anal. Appl.,2001
5. Fuzzy Relational Systems: Foundations and Principles;Belohlavek,2002