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@article{BAG_1991__31_138470, author = {D. Lau and B. Schr\"oder}, title = {On the number of closed subsets of linear functions in the 6-valued logic}, journal = {Beitr\"age zur Algebra und Geometrie}, pages = {19--32}, publisher = {mathdoc}, volume = {31}, year = {1991}, url = {http://geodesic.mathdoc.fr/item/BAG_1991__31_138470/} }
D. Lau; B. Schröder. On the number of closed subsets of linear functions in the 6-valued logic. Beiträge zur Algebra und Geometrie, Tome 31 (1991), pp. 19-32. http://geodesic.mathdoc.fr/item/BAG_1991__31_138470/