Malyshev К. I.; TIKHONENKO, N. Ya. Direct methods for the approximate solution of operator equations with nonzero kernel. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 9, p. 1202–1213, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4836. Acesso em: 11 apr. 2025.