%0 Journal Article %A J. Adamek %A J. Rosicky %T On sifted colimits and generalized varieties %J Theory and applications of categories %D 2001 %P 33-53 %V 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAC_2001_8_a2/ %G en %F TAC_2001_8_a2