%0 Journal Article %A W. Bowen %T The exocenter of a double Heyting algebra %J Colloquium Mathematicum %D 1985 %P 173-185 %V 50 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-50-2-173-185/ %R 10.4064/cm-50-2-173-185 %G fr %F 10_4064_cm_50_2_173_185