РЕДКОЛЕГІЯ. Oleksandr Ivanovych Stepanets’ (on his 80th birthday). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 5, p. 579–581, 2022. DOI: 10.37863/umzh.v74i5.7218. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7218. Acesso em: 8 dec. 2025.