TY - JOUR AU - Greg Hjorth AU - Alexander S. Kechris TI - Recent developments in the theory of Borel reducibility JO - Fundamenta Mathematicae PY - 2001 SP - 21 EP - 52 VL - 170 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm170-1-2/ DO - 10.4064/fm170-1-2 LA - en ID - 10_4064_fm170_1_2 ER -