%0 Journal Article %A Perkel, Manley %T A Characterization of PSL(2, 31) and its Geometry %J Canadian journal of mathematics %D 1980 %P 155-164 %V 32 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-012-5/ %R 10.4153/CJM-1980-012-5 %F 10_4153_CJM_1980_012_5