[7]Hua Dai,"Two algorithms for symmetric linear systems with multiple right-hand sides,"Numerical Mathematics,a Journal of Chinese Univer- sities9(1),91-110(2000) [8 Yuming Shen and Jinxi Zhao"Analysis of peaks and plateaus in a Galerkin/minimal residual pair of methods for solving Ax=b,"Applied Mathematics and Com- putations144,441-455(2003). 8[7 ] Hua Dai,”Two algorithms for symmetric linear systems with multiple right-hand sides,” Numerical Mathematics, a Journal of Chinese Univer￾sities 9(1),91-110(2000). [8 ] Yuming Shen and Jinxi Zhao ”Analysis of peaks and plateaus in a Galerkin/minimal residual pair of methods for solving Ax=b,” Applied Mathematics and Com￾putations 144, 441-455(2003). 8