TY - JOUR AU - Jonsson, W. TI - On a Result of A. M. Macbeath on Normal Subgroups of a Fuchsian Group JO - Canadian mathematical bulletin PY - 1970 SP - 15 EP - 16 VL - 13 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-003-0/ DO - 10.4153/CMB-1970-003-0 ID - 10_4153_CMB_1970_003_0 ER -