1. G. S. Ammar, “Geometric Aspects of Hessenberg Matrices,” Contemporary Mathematics 68, American Mathematical Society, Providence, RI, 1987, pp. 1–21.
2. G. S. Ammar and C. F. Martin, “The Geometry of Matrix Eigen-vaLue Methods,” Acta Applicandae Math., v. 5, 1986, pp. 239–278.
3. G. S. Ammar and V. Merhmann, “On Hamiltonian and Symplectic Hessenberg Forms,” Lin. Algebra Appl., v. 149, 1991, pp. 55–72.
4. B. D. O. Anderson and J. B. Moore, Linear Optimal Control, Prentice-Hall, Englewood Cliffs, 1971.
5. A. BUNSE-GERSTNER and V. Merhmann, “A Symplectic QRlike Algorithm for the SoLution of the Algebraic Riccati Equation,” IEEE Trans. Aut. Control, v. AC-31, 1986, pp. 1104–1113.