MathSciNet bibliographic data MR2085410 65H10 (15A24) Ivanov, Ivan G.; Hasanov, Vejdi I.; Uhlig, Frank Improved methods and starting values to solve the matrix equations $X\pm A^*X^{-1}A=I$$X\pm A^*X^{-1}A=I$ iteratively. Math. Comp. 74 (2005), no. 249, 263–278. Article

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