TY - JOUR AU - Perkel, Manley TI - A Characterization of PSL(2, 31) and its Geometry JO - Canadian journal of mathematics PY - 1980 SP - 155 EP - 164 VL - 32 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-012-5/ DO - 10.4153/CJM-1980-012-5 ID - 10_4153_CJM_1980_012_5 ER -