@article{PORMA_1968__27_2_115064,
     author = {Barros, Constantino M. de},
     title = {Filters in partially ordered sets},
     journal = {Portugaliae mathematica},
     pages = {87--98},
     year = {1968},
     volume = {27},
     number = {2},
     mrnumber = {0270982},
     zbl = {0302.06003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1968__27_2_115064/}
}