［1］Bai Z Z, Golub G H, Ng M K. Hermitian and skew？Hermitian splitting methods for non-Hermitian positive definite linear systems[J].？Siam J Matrix Anal，？2003,24(3)：603-626.？
[2]
［2］Golub G H, Wathen A J. An iteration for indefinite systems and its application to the Navier？stokesequations[J].？Siam J Sci Comput,？1998,19(2):530-539.？
[3]
［3］Wang C L, Bai Z Z. Sufficient conditions for the convergent split tings of non？Hermitian positive definite matrices[J].？Linear Algebra Appl,？2001,330(1-3):215-218.？
[4]
［4］Eiermann M, Niethammer W, Varga R S. Acceleration of relaxation methods for non？Hermitian linear systems[J].？Siam J Matrix Anal,？1992,13(3):979-991.？
[5]
［5］Golub G H, Vanderstracten D. On the preconditioning of matrices with a dominant skew？symmetric component[J].？Numer Algorithms,？2000,25（1）:223-239.？
[6]
［6］Widlund O B. A Lanczos method for a class of nonsymmetrical systems of linear equations[J].？SIAM J Numer Anal,？1978,15(4):801-812.？
[7]
［7］Golub G H, van Loan C F. ？Matrix computations？[M]. 3rd ed. London: the Johns Hopkins University Press,1996.？
[8]
［8］Saad Y, Schultz M H. GMRES: A generalized minimal residual algorithm for solving nonsymmetric linear systems[J].？Siam J Sci Stat Comput,？1986,7(3):856-869.？
[9]
［9］Saad Y, Henk A, van der Vorst. Iterative solution of linear systems in the 20th century[J].？J Comput Appl,？2000,123(1-2):1-33.
