SERDYUK, A. S. Approximation of infinitely differentiable periodic functions by interpolation trigonometric polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 4, p. 495–505, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3771. Acesso em: 5 dec. 2025.