@article{10_4171_ggd_212,
     author = {Noel Brady and Will Dison and Timothy R. Riley},
     title = {Hyperbolic hydra},
     journal = {Groups, geometry, and dynamics},
     pages = {961--976},
     year = {2013},
     volume = {7},
     number = {4},
     doi = {10.4171/ggd/212},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/212/}
}