ABRAMOV, Vyacheslav M. Fixed-point theorem for an infinite Toeplitz matrix and its extension to general infinite matrices. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 76, n. 3, p. 315–325, 2024. DOI: 10.3842/umzh.v76i3.7324. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7324. Acesso em: 5 dec. 2025.