@article{M2AN_1973__7_1_35_0,
     author = {Ladegaillerie, Y.},
     title = {Pr\'efermeture sur un ensemble ordonn\'e},
     journal = {Revue fran\c{c}aise d'automatique informatique recherche op\'erationnelle. Math\'ematique},
     pages = {35--43},
     publisher = {Dunod},
     address = {Paris},
     volume = {7},
     number = {R1},
     year = {1973},
     mrnumber = {364039},
     zbl = {0261.06004},
     language = {fr},
     url = {http://www.numdam.org/item/M2AN_1973__7_1_35_0/}
}