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

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