TY  - JOUR
AU  - A.L. Edmonds
AU  - J.H. Ewing
AU  - R. Kulkarni
TI  - Torsion Free Subgroups of Fuchsian Groups and Tessalations of Surfaces.
JO  - Inventiones mathematicae
PY  - 1982
SP  - 331
EP  - 346
VL  - 69
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1982__69_142957/
ID  - IM_1982__69_142957
ER  -