BABENKO, V. F.; LIGUN, A. A. Some Bernstein-type inequalities for trigonometric polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 3, p. 428–430, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5825. Acesso em: 5 dec. 2025.