TY  - JOUR
AU  - Heiner Zieschang
AU  - Edelgard Gramberg
TI  - Order Reduced Reidemeister-Schreier Subgroup Presentations and Applications.
JO  - Mathematische Zeitschrift
PY  - 1979
SP  - 53
EP  - 70
VL  - 168
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1979__168_172860/
ID  - MZ_1979__168_172860
ER  -