TY  - JOUR
AU  - Karrass, A.
AU  - Solitar, D.
TI  - Subgroups of HNN Groups and Groups with one Defining Relation
JO  - Canadian journal of mathematics
PY  - 1971
SP  - 627
EP  - 643
VL  - 23
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-070-x/
DO  - 10.4153/CJM-1971-070-x
ID  - 10_4153_CJM_1971_070_x
ER  -