TY  - JOUR
AU  - Wolfgang Woess
TI  - Fixed sets and free subgroups of groups acting on metric spaces.
JO  - Mathematische Zeitschrift
PY  - 1993
SP  - 425
EP  - 440
VL  - 214
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174579/
ID  - MZ_1993__214_1_174579
ER  -