EDITORIALBOARD. Index 49th volume of "Ukrainian Mathematical Journal". Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 12, p. 1723–1728, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5180. Acesso em: 5 dec. 2025.