@article{NUMA_1967__10_131775,
     author = {J.W. DANIEL},
     title = {Convergence of the {Conjugate} {Gradient} {Method} with {Computationally} {Convenient} {Modifications.}},
     journal = {Numerische Mathematik},
     pages = {125--131},
     publisher = {mathdoc},
     volume = {10},
     year = {1967},
     zbl = {0178.18302},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1967__10_131775/}
}