@article{10_4171_ggd_148,
     author = {Kevin Wortman},
     title = {Quasi-isometries of rank one $S$-arithmetic lattices},
     journal = {Groups, geometry, and dynamics},
     pages = {787--803},
     year = {2011},
     volume = {5},
     number = {4},
     doi = {10.4171/ggd/148},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/148/}
}