@article{01887447, title = {The surjectivity problem for one-generator, one-relator extensions of torsion-free groups.}, journal = {Geometry \& Topology}, volume = {5}, year = {2001}, pages = {127-142}, doi = {10.2140/gt.2001.5.127}, zbl = {1014.20015}, language = {en}, url = {http://dml.mathdoc.fr/item/01887447} }
Cohen, Marshall M.; Rourke, Colin. The surjectivity problem for one-generator, one-relator extensions of torsion-free groups.. Geometry & Topology, Tome 5 (2001) pp. 127-142. doi : 10.2140/gt.2001.5.127. http://gdmltest.u-ga.fr/item/01887447/