%0 Journal Article %A Greg Hjorth %A Alexander S. Kechris %T Recent developments in the theory of Borel reducibility %J Fundamenta Mathematicae %D 2001 %P 21-52 %V 170 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm170-1-2/ %R 10.4064/fm170-1-2 %G en %F 10_4064_fm170_1_2