@article{GDZPPN00117035X,
title = {Higher Order Convergence Results for the Rayleigh-Ritz Method Applied to Eigenvalue Problems: 2. Improved Error Bounds for Eigenfunctions.},
journal = {Numerische Mathematik},
volume = {19},
year = {1972},
pages = {155-169},
zbl = {0223.65080},
url = {http://dml.mathdoc.fr/item/GDZPPN00117035X}
}
Varga, R.S.; Pierce, J.G. Higher Order Convergence Results for the Rayleigh-Ritz Method Applied to Eigenvalue Problems: 2. Improved Error Bounds for Eigenfunctions.. Numerische Mathematik, Tome 19 (1972) pp. 155-169. http://gdmltest.u-ga.fr/item/GDZPPN00117035X/