LUKOVSKY , I. A. et al. Ihor Oleksandrovych Shevchuk (on his 75th birthday). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 4, p. 439–442, 2022. DOI: 10.37863/umzh.v74i4.7139. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7139. Acesso em: 8 dec. 2025.