SERDYUK, A. S. Approximation of Infinitely Differentiable Periodic Functions by Interpolation Trigonometric Polynomials in Integral Metric. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 12, p. 1654–1663, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4385. Acesso em: 6 dec. 2025.