POLULYAKH, E. O.; VLASENKO, I. Yu. On iteration stability of the Birkhoff center with respect to power 2. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 5, p. 705–707, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3487. Acesso em: 5 dec. 2025.