1. The Autonomous Linear Quadratic Control Problem;Mehrmann,1991
2. Linear Optimal Control Systems;Kwakernaak,1972
3. Algebraic Riccati Equations;Lancaster,1995
4. V. Simoncini, Computational Methods for Linear Matrix Equations (Survey Article), Technical Report, Dipartimento di Matematica, Universita di Bologna, Italy, 2014.