TY - JOUR AU - Sacerdote, George S. TI - On the Groups of Britton's Theorem A JO - Canadian journal of mathematics PY - 1976 SP - 635 EP - 639 VL - 28 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-063-2/ DO - 10.4153/CJM-1976-063-2 ID - 10_4153_CJM_1976_063_2 ER -