%0 Journal Article %A F. Borceux %A J. Rosicky %T On von Neumann varieties %J Theory and applications of categories %D 2004 %P 5-26 %V 13 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAC_2004_13_a0/ %G en %F TAC_2004_13_a0