@article{GDZPPN002434881,
title = {Discreteness Conditions for the Laplacian on Complete, Non-Compact Riemannian Manifolds.},
journal = {Mathematische Zeitschrift},
volume = {199},
year = {1988},
pages = {127-142},
zbl = {0622.53024},
url = {http://dml.mathdoc.fr/item/GDZPPN002434881}
}
Kleine, Regina. Discreteness Conditions for the Laplacian on Complete, Non-Compact Riemannian Manifolds.. Mathematische Zeitschrift, Tome 199 (1988) pp. 127-142. http://gdmltest.u-ga.fr/item/GDZPPN002434881/