%0 Journal Article %A Sarah Whitehouse %T A Counterexample to a Conjecture of Barr %J Theory and applications of categories %D 1996 %P 36-39 %V 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAC_1996_2_a2/ %G en %F TAC_1996_2_a2