MathSciNet bibliographic data MR1217209 15A24 (15A48) Engwerda, Jacob C.; Ran, André C. M.; Rijkeboer, Arie L. Necessary and sufficient conditions for the existence of a positive definite solution of the matrix equation \$X+A\sp *X\sp {-1}A=Q\$$X+A\sp *X\sp {-1}A=Q$. Linear Algebra Appl. 186 (1993), 255–275. Article

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