Ivanov А. F. et al. Oleksandr Mykolaiovych Sharkovs’kyi (on his 80th birthday). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 2, p. 257–260, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1690. Acesso em: 5 dec. 2025.