%0 Journal Article %A Michael Barr %A W.D. Burgess %A R. Raphael %T Ring epimorphisms and C(X) %J Theory and applications of categories %D 2003 %P 283-308 %V 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAC_2003_11_a11/ %G en %F TAC_2003_11_a11