BAKHTIN, A. K.; BAKHTINA, G. P. On extremal problems for symmetric disjoint domains. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 2, p. 179–185, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4995. Acesso em: 6 dec. 2025.