@article{GDZPPN002423510,
title = {Lower Bounds for the Eigenvalues of Negatively Curved Manifolds.},
journal = {Mathematische Zeitschrift},
volume = {174},
year = {1980},
pages = {29-40},
zbl = {0413.58020},
url = {http://dml.mathdoc.fr/item/GDZPPN002423510}
}
Donnelly, Harold; Li, Peter. Lower Bounds for the Eigenvalues of Negatively Curved Manifolds.. Mathematische Zeitschrift, Tome 174 (1980) pp. 29-40. http://gdmltest.u-ga.fr/item/GDZPPN002423510/