1. Lattice Theory;Birkhoff,1967
2. Algebraic Theory of Lattices;Crawley,1973
3. Resolution of composite fuzzy relation equations;Sanchez;Inform. and Control,1976
4. A method of solution to fuzzy inverse problems;Tsukamoto;Trans. Soc. Instrum. Control Eng.,1979
5. Generalized fuzzy matrices;Kim;Fuzzy Sets and Systems,1980