TY  - JOUR
AU  - William L. Paschke
TI  - A numerical invariant for finitely generated groups via actions on graphs.
JO  - Mathematica Scandinavica
PY  - 1993
SP  - 148
EP  - 160
VL  - 72
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1993__72_1_167243/
ID  - MS2_1993__72_1_167243
ER  -