SAVCHUK, V. V.; CHAICHENKO, S. O. Best Approximations for the Cauchy Kernel on the Real Axis. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 11, p. 1540–1549, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2244. Acesso em: 5 dec. 2025.