On Stable Perturbations of the Stiffly Weighted Pseudoinverse and Weighted Least Squares Problem. Journal of Computational Mathematics, [S. l.], v. 23, n. 5, p. 527–536, 2005. Disponível em: https://www.global-sci.com/index.php/JCM/article/view/11730. Acesso em: 5 dec. 2025.