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@article{PORMA_1957__16_3_114790, author = {Evans, Trevor and Hardy, Lane}, title = {Sheffer stroke functions in many-valued logics}, journal = {Portugaliae mathematica}, pages = {83--93}, publisher = {mathdoc}, volume = {16}, number = {3}, year = {1957}, mrnumber = {0102478}, zbl = {0086.24503}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1957__16_3_114790/} }
Evans, Trevor; Hardy, Lane. Sheffer stroke functions in many-valued logics. Portugaliae mathematica, Tome 16 (1957) no. 3, pp. 83-93. http://geodesic.mathdoc.fr/item/PORMA_1957__16_3_114790/