@article{GDZPPN00117133X,
title = {Conjugate Direction Methods for Solving Systems of Linear Equations.},
journal = {Numerische Mathematik},
volume = {21},
year = {1973},
pages = {285-297},
zbl = {0253.65017},
url = {http://dml.mathdoc.fr/item/GDZPPN00117133X}
}
Stewart, G.W. Conjugate Direction Methods for Solving Systems of Linear Equations.. Numerische Mathematik, Tome 21 (1973) pp. 285-297. http://gdmltest.u-ga.fr/item/GDZPPN00117133X/