@article{GDZPPN001164627,
title = {Optimale Eigenwerteinschlie\ss ungen.},
journal = {Numerische Mathematik},
volume = {5},
year = {1963},
pages = {246-272},
url = {http://dml.mathdoc.fr/item/GDZPPN001164627}
}
LEHMANN, N.J. Optimale Eigenwerteinschließungen.. Numerische Mathematik, Tome 5 (1963) pp. 246-272. http://gdmltest.u-ga.fr/item/GDZPPN001164627/