@article{GDZPPN002330520,
title = {Lower Bounds for Eigenfunctions on Riemannian Manifolds.},
journal = {Mathematische Annalen},
volume = {277},
year = {1987},
pages = {653-672},
zbl = {0619.58038},
url = {http://dml.mathdoc.fr/item/GDZPPN002330520}
}
Donnelly, Harold. Lower Bounds for Eigenfunctions on Riemannian Manifolds.. Mathematische Annalen, Tome 277 (1987) pp. 653-672. http://gdmltest.u-ga.fr/item/GDZPPN002330520/