TY  - JOUR
AU  - Walter D. Neumann
TI  - On Leighton’s graph covering theorem
JO  - Groups, geometry, and dynamics
PY  - 2010
SP  - 863
EP  - 872
VL  - 4
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4171/ggd/111/
DO  - 10.4171/ggd/111
ID  - 10_4171_ggd_111
ER  -