@article{GT_2001_5_1_a4,
     author = {Cohen, Marshall M and Rourke, Colin},
     title = {The surjectivity problem for one-generator, one-relator extensions of torsion-free groups},
     journal = {Geometry & topology},
     pages = {127--142},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {2001},
     doi = {10.2140/gt.2001.5.127},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2001.5.127/}
}