Orthogonal Projections and the Perturbation of the Eigenvalues of Singular Pencils. Journal of Computational Mathematics, [S. l.], v. 1, n. 1, p. 63–74, 2018. Disponível em: https://www.global-sci.com/index.php/JCM/article/view/10710. Acesso em: 5 dec. 2025.