EDITORIALBOARD. Index of volume 64 of „Ukrainian Mathematical Journal”. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 12, p. 1723–1728, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2694. Acesso em: 6 dec. 2025.