@article{PORMA_1942__3_3_114608,
     author = {Monteiro, Ant\'onio and Ribeiro, Hugo},
     title = {L'op\'eration de fermeture et ses invariants dans les syst\`emes partiellement ordonn\'es},
     journal = {Portugaliae mathematica},
     pages = {171--184},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1942},
     mrnumber = {0007973},
     zbl = {0027.43202},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1942__3_3_114608/}
}