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@article{JRAM_1985__357_152710, author = {Robert Brooks}, title = {The bottom of the spectrum of a {Riemannian} covering.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {101--114}, publisher = {mathdoc}, volume = {357}, year = {1985}, zbl = {0553.53027}, url = {http://geodesic.mathdoc.fr/item/JRAM_1985__357_152710/} }
Robert Brooks. The bottom of the spectrum of a Riemannian covering.. Journal für die reine und angewandte Mathematik, Tome 357 (1985), pp. 101-114. http://geodesic.mathdoc.fr/item/JRAM_1985__357_152710/