Mathematics of Computation, Vol. 32, No. 144 (Oct., 1978), pp. 1183-1213 (31 pages) This paper furnishes two classes of methods for calculating the best approximate solution of an operator equation in ...

SIAM Journal on Numerical Analysis, Vol. 12, No. 4 (Sep., 1975), pp. 617-629 (13 pages) The method of conjugate gradients for solving systems of linear equations with a symmetric positive definite ...