TY - JOUR AU - Frederick W. Gehring AU - Gaven J. Martin TI - Minimal co-volume hyperbolic lattices, I: The spherical points of a Kleinian group JO - Annals of mathematics PY - 2009 SP - 123 EP - 161 VL - 170 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4007/annals.2009.170.123/ DO - 10.4007/annals.2009.170.123 LA - en ID - 10_4007_annals_2009_170_123 ER -