1. L. Andersson, SSOR preconditioning of Toeplitz matrices with application to elliptic equations, Department of Computer Sciences, 75.02, Chalmers University of Tech.
2. Geodetic normal equations;Ashkenazi,1971
3. O. Axelsson, On preconditioning and convergence acceleration in sparse matrix problems, CERN 74–10, Geneva.
4. Elimination with weighted row combinations for solving linear equations and least squares problems;Bauer;Num. Math.,1965
5. On iterative computation of generalized inverses and associated projections;Ben-Israel;SIAM J. Numer. Anal.,1966