URUMBAEV, A. N. On finite-dimensional approximation of solutions of ill-posed problems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 2, p. 289–295, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5005. Acesso em: 14 apr. 2025.