Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1977__13_3_a2, author = {Chvalina, Jan}, title = {Isomorphic algebraic pre-closures and equivalent set-systems}, journal = {Archivum mathematicum}, pages = {141--147}, publisher = {mathdoc}, volume = {13}, number = {3}, year = {1977}, mrnumber = {0463076}, zbl = {0373.08001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1977__13_3_a2/} }
Chvalina, Jan. Isomorphic algebraic pre-closures and equivalent set-systems. Archivum mathematicum, Tome 13 (1977) no. 3, pp. 141-147. http://geodesic.mathdoc.fr/item/ARM_1977__13_3_a2/