LEVISHCHENKO, S. S. On the Kiev Mathematical Society (since March 11, 1993). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 5, p. 720, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5463. Acesso em: 5 dec. 2025.