@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/}
}