SAVCHUK, V. V. Best Linear Methods of Approximation of Functions of the Hardy Class $H_p$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 7, p. 919–925, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3967. Acesso em: 6 dec. 2025.