@article{PORMA_1981__40_1_115440,
     author = {Porta, Hor\'acio},
     title = {Sur quelques alg\`ebres de la {Logique}},
     journal = {Portugaliae mathematica},
     pages = {41--77},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {1981},
     mrnumber = {0796090},
     zbl = {0581.03046},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_1_115440/}
}