@article{1102971637,
author = {Kuttler, J. R.},
title = {Upper and lower bounds for eigenvalues by finite differences.},
journal = {Pacific J. Math.},
volume = {35},
number = {3},
year = {1970},
pages = { 429-440},
language = {en},
url = {http://dml.mathdoc.fr/item/1102971637}
}
Kuttler, J. R. Upper and lower bounds for eigenvalues by finite differences.. Pacific J. Math., Tome 35 (1970) no. 3, pp. 429-440. http://gdmltest.u-ga.fr/item/1102971637/