@article{10_4171_ggd_176,
     author = {Igor Belegradek and G. Christopher Hruska},
     title = {Hyperplane arrangements in negatively curved manifolds  and relative hyperbolicity},
     journal = {Groups, geometry, and dynamics},
     pages = {13--38},
     year = {2013},
     volume = {7},
     number = {1},
     doi = {10.4171/ggd/176},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/176/}
}