@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/