Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1966__7_3_a8, author = {Havel, V\'aclav}, title = {Join systems and closure spaces}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {335--341}, publisher = {mathdoc}, volume = {07}, number = {3}, year = {1966}, mrnumber = {0212650}, zbl = {0146.16105}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1966__7_3_a8/} }
Havel, Václav. Join systems and closure spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 07 (1966) no. 3, pp. 335-341. http://geodesic.mathdoc.fr/item/CMUC_1966__7_3_a8/