KORNEICHUK, N. P. Information aspects in the theory of approximation and recovery of operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 3, p. 314–327, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4615. Acesso em: 5 dec. 2025.