IvanovA. F., MaistrenkoYu. L., and РоманенкоО. “To the Bright Memory of Oleksandr Mykolayovych Sharkovsky. Sixty Years of the Famous Sharkovsky’s Theorem”. Ukrains’kyi Matematychnyi Zhurnal 76, no. 1 (February 2, 2024): 3 - 4. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8138.