@article{GDZPPN001165720,
title = {On the Accuracy of Finite Difference Approximations to the Eigenvalues of Differential and Integral Operators.},
journal = {Numerische Mathematik},
volume = {7},
year = {1965},
pages = {412-419},
zbl = {0135.37702},
url = {http://dml.mathdoc.fr/item/GDZPPN001165720}
}
KELLER, H.B. On the Accuracy of Finite Difference Approximations to the Eigenvalues of Differential and Integral Operators.. Numerische Mathematik, Tome 7 (1965) pp. 412-419. http://gdmltest.u-ga.fr/item/GDZPPN001165720/