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@article{PORMA_1968__27_2_115064, author = {Barros, Constantino M. de}, title = {Filters in partially ordered sets}, journal = {Portugaliae mathematica}, pages = {87--98}, publisher = {mathdoc}, volume = {27}, number = {2}, year = {1968}, mrnumber = {0270982}, zbl = {0302.06003}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1968__27_2_115064/} }
Barros, Constantino M. de. Filters in partially ordered sets. Portugaliae mathematica, Tome 27 (1968) no. 2, pp. 87-98. http://geodesic.mathdoc.fr/item/PORMA_1968__27_2_115064/