Hestenes, M.R., and Stiefel, E., 1952,
Methods of
conjugate gradients for solving linear systems:
J. Res. Natl. Bur. Stand., 49, 409-436.
Paige, C.C., and Saunders, M.A., 1982a,
LSQR: an algorithm for sparse linear equations
and sparse least squares:
Assn. Comp. Mach. Trans. Mathematical Software,
8, 43-71.
Paige, C.C., and Saunders, M.A., 1982b,
Algorithm 583, LSQR:
sparse linear equations and least squares problems:
Assn. Comp. Mach. Trans. Mathematical Software,
8, 195-209.
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