@article{GDZPPN00117228X,
title = {The Convergence of the Method of Conjugate Gradients at Isolated Extreme Points of the Spectrum.},
journal = {Numerische Mathematik},
volume = {25},
year = {1975},
pages = {85-94},
zbl = {0295.65026},
url = {http://dml.mathdoc.fr/item/GDZPPN00117228X}
}
Stewart, G.W. The Convergence of the Method of Conjugate Gradients at Isolated Extreme Points of the Spectrum.. Numerische Mathematik, Tome 25 (1975) pp. 85-94. http://gdmltest.u-ga.fr/item/GDZPPN00117228X/