@article{GDZPPN001168363,
title = {Nested Bounds for the Spectral Radius.},
journal = {Numerische Mathematik},
volume = {15},
year = {1970},
pages = {49-70},
zbl = {0221.65063},
url = {http://dml.mathdoc.fr/item/GDZPPN001168363}
}
VARGA, R.S.; MAREK, I. Nested Bounds for the Spectral Radius.. Numerische Mathematik, Tome 15 (1970) pp. 49-70. http://gdmltest.u-ga.fr/item/GDZPPN001168363/