TY - JOUR AU - Levine, Jerome TI - Homology cylinders: an enlargement of the mapping class group JO - Algebraic and Geometric Topology PY - 2001 SP - 243 EP - 270 VL - 1 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.2140/agt.2001.1.243/ DO - 10.2140/agt.2001.1.243 ID - 10_2140_agt_2001_1_243 ER -