1. Abstract and Concrete Categories: The Joy of Cats;Adámek,1990
2. Lattice Theory;Birkhoff,1979
3. Handbook of Categorical Algebra 1: Basic Category Theory;Borceux,1994
4. A Compendium of Continuous Lattices;Gierz,1980
5. L-fuzzy sets;Goguen;J. Math. Anal. Appl.,1967