%0 Journal Article %A Dietze, Anke %A Schaps, Mary %T Determining Subgroups of a Given Finite Index in a Finitely Presented Group %J Canadian journal of mathematics %D 1974 %P 769-782 %V 26 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-072-0/ %R 10.4153/CJM-1974-072-0 %F 10_4153_CJM_1974_072_0