BAKHTIN, A. K.; VYHOVS'KA, L.V.; DENEGA, I. V. Inequalities for inner radii of symmetric disjoint domains. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 9, p. 1282–1288, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1634. Acesso em: 5 dec. 2025.