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@article{PORMA_1952__11_3_114708, author = {G\"otlind, Erik}, title = {Some {Sheffer} functions in n-valued logic}, journal = {Portugaliae mathematica}, pages = {141--149}, publisher = {mathdoc}, volume = {11}, number = {3}, year = {1952}, mrnumber = {0053882}, zbl = {0047.01601}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1952__11_3_114708/} }
Götlind, Erik. Some Sheffer functions in n-valued logic. Portugaliae mathematica, Tome 11 (1952) no. 3, pp. 141-149. http://geodesic.mathdoc.fr/item/PORMA_1952__11_3_114708/