@article{GDZPPN001180835,
title = {Correction of Finite Element Estimates for Sturm-Liouville Eigenvalues.},
journal = {Numerische Mathematik},
volume = {50},
year = {1986},
pages = {205-216},
zbl = {0588.65062},
url = {http://dml.mathdoc.fr/item/GDZPPN001180835}
}
Andrew, Alan L.; Paine, John W. Correction of Finite Element Estimates for Sturm-Liouville Eigenvalues.. Numerische Mathematik, Tome 50 (1986) pp. 205-216. http://gdmltest.u-ga.fr/item/GDZPPN001180835/