PODVYSOTSKII, R. V. Estimation of the product of inner radii of partially nonoverlapping domains. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 7, p. 1004–1008, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3218. Acesso em: 5 dec. 2025.