@article{NUMA_1973__21_132235,
     author = {G.W. Stewart},
     title = {Conjugate {Direction} {Methods} for {Solving} {Systems} of {Linear} {Equations.}},
     journal = {Numerische Mathematik},
     pages = {285--297},
     publisher = {mathdoc},
     volume = {21},
     year = {1973},
     zbl = {0253.65017},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1973__21_132235/}
}