IVANOV, I. A method for solving the spectral problem of Hamiltonian matrices with application to the algebraic Riccati equation. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 92, p. 105–121, 2000. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/258. Acesso em: 23 nov. 2024.