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@article{PORMA_1962__21_4_114893, author = {Morgado, Jos\'e}, title = {On the closure operators of the ordinal product of partially ordered sets}, journal = {Portugaliae mathematica}, pages = {209--220}, publisher = {mathdoc}, volume = {21}, number = {4}, year = {1962}, mrnumber = {0148574}, zbl = {0107.25301}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1962__21_4_114893/} }
Morgado, José. On the closure operators of the ordinal product of partially ordered sets. Portugaliae mathematica, Tome 21 (1962) no. 4, pp. 209-220. http://geodesic.mathdoc.fr/item/PORMA_1962__21_4_114893/