VAKARCHUK, S. B. On the best polynomial approximation of entire transcendental functions in Banach spaces. II. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 10, p. 1318–1322, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5609. Acesso em: 6 dec. 2025.