MathSciNet bibliographic data MR2087529 15A24 Hasanov, V. I.; Ivanov, I. G. Solutions and perturbation estimates for the matrix equations $X\pm A^* X^{-n}A=Q$$X\pm A^* X^{-n}A=Q$. Appl. Math. Comput. 156 (2004), no. 2, 513–525. Article

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