MathSciNet bibliographic data MR1983196 15A24 (65F30) Liu, Xin-Guo; Gao, Hua On the positive definite solutions of the matrix equations $X\sp s\pm A\sp {\ssf T}X\sp {-t}A=I\sb n$$X\sp s\pm A\sp {\ssf T}X\sp {-t}A=I\sb n$. Linear Algebra Appl. 368 (2003), 83–97. Article

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