%0 Journal Article %A Church, Alonzo %T Conditioned disjunction as a primitive connective for the propositional calculus %J Portugaliae mathematica %D 1948 %P 87-90 %V 7 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1948__7_2_114661/ %G en %F PORMA_1948__7_2_114661