EDITORIALBOARD. Igor Skrypnyk. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 7, p. 1007–1008, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3660. Acesso em: 5 dec. 2025.