%0 Journal Article %A Hjorth, Greg %T When is an equivalance relation classifiable %J Documenta mathematica %D 1998 %P 23-32 %V ICM Berlin 1998, Vol. II %I mathdoc %U http://geodesic.mathdoc.fr/item/DOCMA_1998__S8__a80/ %G en %F DOCMA_1998__S8__a80