@article{01605726, title = {Homology cylinders: an enlargement of the mapping class group.}, journal = {Geometry \& Topology}, volume = {5}, year = {2001}, pages = {243-270}, doi = {10.2140/agt.2001.1.243}, zbl = {0978.57015}, language = {en}, url = {http://dml.mathdoc.fr/item/01605726} }
Levine, Jerome. Homology cylinders: an enlargement of the mapping class group.. Geometry & Topology, Tome 5 (2001) pp. 243-270. doi : 10.2140/agt.2001.1.243. http://gdmltest.u-ga.fr/item/01605726/