EDITORIAL BOARD OF THE "UKRAINIAN MATHEMATICAL JOURNAL". Yuri Kondratiev (1953–2023). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 4, p. 239–243, 2025. DOI: 10.3842/umzh.v77i4.9074. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9074. Acesso em: 5 dec. 2025.