@article{NUMA_1987__51_133192,
     author = {O. Axelsson},
     title = {A {Generalized} {Conjugate} {Gradient,} {Least} {Square} {Method.}},
     journal = {Numerische Mathematik},
     pages = {209--228},
     publisher = {mathdoc},
     volume = {51},
     year = {1987},
     zbl = {0596.65014},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1987__51_133192/}
}