PICHUGOV, S. A. Nikol’skii – Stechkin-type inequalities for the increments of trigonometric polynomials in metric spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 5, p. 711–716, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1730. Acesso em: 5 dec. 2025.