TY  - JOUR
AU  - K. Vogtmann
AU  - M. Culler
TI  - Moduli of graphs and automorphisms of free groups.
JO  - Inventiones mathematicae
PY  - 1986
SP  - 91
EP  - 120
VL  - 84
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1986__84_143335/
ID  - IM_1986__84_143335
ER  -