@article{10_4171_ggd_135,
     author = {Darren D. Long and Alan W. Reid},
     title = {Grothendieck{\textquoteright}s problem for 3-manifold groups},
     journal = {Groups, geometry, and dynamics},
     pages = {479--499},
     year = {2011},
     volume = {5},
     number = {2},
     doi = {10.4171/ggd/135},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/135/}
}