MathSciNet bibliographic data MR2039300 (2005b:15029) 15A24 Hasanov, V. I.; Ivanov, I. G.; Uhlig, F. Improved perturbation estimates for the matrix equations $X\pm A\sp \ast X\sp {-1}A=Q$$X\pm A\sp \ast X\sp {-1}A=Q$. Tenth Conference of the International Linear Algebra Society. Linear Algebra Appl. 379 (2004), 113–135. Article

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