BAKHTIN, A. K. Extremal problems of nonoverlapping domains with free poles on a circle. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 7, p. 867–886, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3503. Acesso em: 6 dec. 2025.