TY  - JOUR
AU  - Karrass, A.
AU  - Solitar, D.
TI  - On a Theorem of Cohen and Lyndon About Free Bases for Normal Subgroups
JO  - Canadian journal of mathematics
PY  - 1972
SP  - 1086
EP  - 1091
VL  - 24
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-112-0/
DO  - 10.4153/CJM-1972-112-0
ID  - 10_4153_CJM_1972_112_0
ER  -