1. Monades et descente;Bénabou;Compt. Rend. Acad. Sci. Paris Ser A,1970
2. Improving constructions in topology;Bentley,1991
3. Elements of Mathematics;Bourbaki,1966
4. Topological Spaces;Čech,1966
5. Convergence;Choquet;Ann. Univ. Grenoble Sect. Sci. Math. Phys. (N.S.),1948