KORNEICHUK, N. P. Information widths. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 11, p. 1506–1518, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5541. Acesso em: 6 dec. 2025.