1. Abstract and Concrete Categories;Adamek,1989
2. Topological spaces;Čech,1966
3. Regular convergence spaces;Cook;Math. Ann.,1967
4. Lattice-valued spaces: fuzzy convergence;Flores;Fuzzy Sets and Systems,2006
5. W. Gähler, Monadic topology—a new concept of generalized topology, in: Recent Developments of General Topology, Mathematical Research, vol. 67, Berlin, 1967, pp. 136–149.