@article{1183528180,
author = {Stenger, William},
title = {On Poincar\'e's bounds for higher eigenvalues},
journal = {Bull. Amer. Math. Soc.},
volume = {72},
number = {4},
year = {1966},
pages = { 715-718},
language = {en},
url = {http://dml.mathdoc.fr/item/1183528180}
}
Stenger, William. On Poincaré's bounds for higher eigenvalues. Bull. Amer. Math. Soc., Tome 72 (1966) no. 4, pp. 715-718. http://gdmltest.u-ga.fr/item/1183528180/