Makarov, V.L. et al. 2023. Volodymyr Dmytrovych Koshmanenko (on his 80 th birthday). Ukrains’kyi Matematychnyi Zhurnal. 75, 9 (Sep. 2023), 1294–1296. DOI:https://doi.org/10.3842/umzh.v75i9.7771.