MELNIK, Yu. I. Approximation of functions regular in convex polygons by exponential polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 4, p. 446–452, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9179. Acesso em: 6 dec. 2025.