@article{05029615, title = {Homology cylinders and the acyclic closure of a free group.}, journal = {Geometry \& Topology}, volume = {6}, year = {2006}, pages = {603-631}, doi = {10.2140/agt.2006.6.603}, zbl = {1149.57001}, language = {en}, url = {http://dml.mathdoc.fr/item/05029615} }
Sakasai, Takuya. Homology cylinders and the acyclic closure of a free group.. Geometry & Topology, Tome 6 (2006) pp. 603-631. doi : 10.2140/agt.2006.6.603. http://gdmltest.u-ga.fr/item/05029615/