@article{GDZPPN001177931,
title = {On the Steps of Convergence of Approximate Eigenvectors in the Rayleigh-Schr\"odinger Series.},
journal = {Numerische Mathematik},
volume = {42},
year = {1983},
pages = {31-50},
zbl = {0538.65034},
url = {http://dml.mathdoc.fr/item/GDZPPN001177931}
}
Limaye, B.V.; Kulkarni, R.P. On the Steps of Convergence of Approximate Eigenvectors in the Rayleigh-Schrödinger Series.. Numerische Mathematik, Tome 42 (1983) pp. 31-50. http://gdmltest.u-ga.fr/item/GDZPPN001177931/