TY - JOUR AU - Sullivan, Dennis TI - The density at infinity of a discrete group of hyperbolic motions JO - Publications Mathématiques de l'IHÉS PY - 1979 DA - 1979/// SP - 171 EP - 202 VL - 50 PB - Institut des Hautes Études Scientifiques UR - http://www.numdam.org/item/PMIHES_1979__50__171_0/ UR - https://zbmath.org/?q=an%3A0439.30034 UR - https://www.ams.org/mathscinet-getitem?mr=81b:58031 LA - en ID - PMIHES_1979__50__171_0 ER -