TY  - JOUR
AU  - Harold Donnelly
TI  - Elliptic operators and covers of Riemannian manifolds.
JO  - Mathematische Zeitschrift
PY  - 1996
SP  - 303
EP  - 308
VL  - 223
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1996__223_3_174921/
ID  - MZ_1996__223_3_174921
ER  -