EDITORIALBOARD. Index of volume 57 of „Ukrainian Mathematical Journal”. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 12, p. 1725–1729, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3723. Acesso em: 5 dec. 2025.