EDITORIALBOARD. Index of volume 63 of „Ukrainian Mathematical Journal”. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 12, p. 1724–1729, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2838. Acesso em: 5 dec. 2025.