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@article{MZ_1996__223_3_174921, author = {Harold Donnelly}, title = {Elliptic operators and covers of {Riemannian} manifolds.}, journal = {Mathematische Zeitschrift}, pages = {303--308}, publisher = {mathdoc}, volume = {223}, number = {3}, year = {1996}, zbl = {0871.58075}, url = {http://geodesic.mathdoc.fr/item/MZ_1996__223_3_174921/} }
Harold Donnelly. Elliptic operators and covers of Riemannian manifolds.. Mathematische Zeitschrift, Tome 223 (1996) no. 3, pp. 303-308. http://geodesic.mathdoc.fr/item/MZ_1996__223_3_174921/