MathSciNet bibliographic data MR1243822 (94j:15013) 15A24 Engwerda, Jacob C. On the existence of a positive definite solution of the matrix equation \$X+A\sp {\ssf T}X\sp {-1}A=I\$$X+A\sp {\ssf T}X\sp {-1}A=I$. Linear Algebra Appl. 194 (1993), 91–108. Article

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