MathSciNet bibliographic data MR1637909 (99c:15019) 15A24 Ivanov, Ivan G.; El-sayed, Salah M. Properties of positive definite solutions of the equation \$X+A\sp *X\sp {-2}A=I\$$X+A\sp *X\sp {-2}A=I$. Linear Algebra Appl. 279 (1998), no. 1-3, 303–316. Article

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