%0 Journal Article %A Sacerdote, George S. %T On the Groups of Britton's Theorem A %J Canadian journal of mathematics %D 1976 %P 635-639 %V 28 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-063-2/ %R 10.4153/CJM-1976-063-2 %F 10_4153_CJM_1976_063_2