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@article{PORMA_1960__19_2_114835, author = {Morgado, Jos\'e}, title = {Some results on closure operators of partially ordered sets}, journal = {Portugaliae mathematica}, pages = {101--139}, publisher = {mathdoc}, volume = {19}, number = {2}, year = {1960}, mrnumber = {0133260}, zbl = {0103.26702}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1960__19_2_114835/} }
Morgado, José. Some results on closure operators of partially ordered sets. Portugaliae mathematica, Tome 19 (1960) no. 2, pp. 101-139. http://geodesic.mathdoc.fr/item/PORMA_1960__19_2_114835/