EDITORIALBOARD. Jubilees Mykola I. Shkil’ (on his 60th birthday). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 2, p. 303–304, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5813. Acesso em: 5 dec. 2025.