If X is a quasitopological space -Spanier space in this paper-, a topological space q X can be associated to X. A subset F of X is called closed if it is closed in q X. Interesting properties of the closed subspaces of a quasitopological space are examined.
@article{urn:eudml:doc:39767, title = {La notion de ferm\'e dans un espace de Spanier.}, journal = {Revista Matem\'atica Hispanoamericana}, volume = {39}, year = {1979}, pages = {173-183}, zbl = {0467.54002}, language = {fr}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:39767} }
Martínez Calvo, Cristina. La notion de fermé dans un espace de Spanier.. Revista Matemática Hispanoamericana, Tome 39 (1979) pp. 173-183. http://gdmltest.u-ga.fr/item/urn:eudml:doc:39767/