@article{10_4171_ggd_404,
     author = {Hao Chen and Jean-Philippe Labb\'e},
     title = {Limit directions for {Lorentzian} {Coxeter} systems},
     journal = {Groups, geometry, and dynamics},
     pages = {469--498},
     year = {2017},
     volume = {11},
     number = {2},
     doi = {10.4171/ggd/404},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/404/}
}