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 Y. Saad, Iterative methods for sparse linear systems, PWS press, New York, 1995.
 Z.-Z Bai, G.H. Golub and M.K. Ng, Hermitian and skew-Hermitian splitting methods for non-Hermitian positive definite linear systems, SIAM. J. Matrix Anal. Appl. 24 (2003) 603–626.
 J. Palmer, Conjugate direction methods and parallel computing, Ph.D. Thesis, Stanford University, Stanford, CA, 1974.