BAKHTIN, A. K.; DVORAK, I. Ya.; ZABOLOTNYI, Ya. V. Estimates of the product of inner radii of five nonoverlapping domains. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 2, p. 261–267, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1691. Acesso em: 5 dec. 2025.