Ivanov, A.F. et al. 2024. To the bright memory of Oleksandr Mykolayovych Sharkovsky. Sixty years of the famous Sharkovsky’s theorem. Ukrains’kyi Matematychnyi Zhurnal. 76, 1 (Feb. 2024), 3–4. DOI:https://doi.org/10.3842/umzh.v76i1.8138.