SAVCHUK, V. V.; SAVCHUK, M. V.; CHAICHENKO, S. O. Approximation of bounded holomorphic and harmonic functions by Fejér means. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 4, p. 516–542, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1455. Acesso em: 5 dec. 2025.