EDITORIAL BOARD. Alphabetic index of the 23d volume of the Ukrainian mathematical journal . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 6, p. 856–859, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8642. Acesso em: 5 dec. 2025.