%0 Journal Article %A Steven Vickers %T The double powerlocale and exponentiation: A case study in geometric logic %J Theory and applications of categories %D 2004 %P 372-422 %V 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAC_2004_12_a12/ %G en %F TAC_2004_12_a12