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@article{JRAM_1979__305_152075, author = {Su-shing Chen}, title = {Poincar\'e series and negatively curved manifolds.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {77--81}, publisher = {mathdoc}, volume = {305}, year = {1979}, zbl = {0397.53033}, url = {http://geodesic.mathdoc.fr/item/JRAM_1979__305_152075/} }
Su-shing Chen. Poincaré series and negatively curved manifolds.. Journal für die reine und angewandte Mathematik, Tome 305 (1979), pp. 77-81. http://geodesic.mathdoc.fr/item/JRAM_1979__305_152075/