@article{CMH_1970__45_139423,
     author = {Giovanni Coray},
     title = {Validit\'e dans les alg\`ebres de {Boole} partielles.},
     journal = {Commentarii mathematici Helvetici},
     pages = {49--82},
     publisher = {mathdoc},
     volume = {45},
     year = {1970},
     zbl = {0187.26701},
     url = {http://geodesic.mathdoc.fr/item/CMH_1970__45_139423/}
}