TY  - JOUR
AU  - Viktor Schroeder
AU  - Susana Fornari
TI  - Ramified Coverings with Nonpositive Curvature.
JO  - Mathematische Zeitschrift
PY  - 1990
SP  - 123
EP  - 128
VL  - 203
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1990__203_3_174117/
ID  - MZ_1990__203_3_174117
ER  -