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Saad, Youcef; Schultz, Martin H. . (1986). GMRES: A Generalized Minimal Residual Algorithm for Solving Nonsymmetric Linear Systems. SIAM Journal on Scientific and Statistical Computing, 7(3), 856–869. doi:10.1137/0907058 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research