Rybalchenko, Nina, Stanislav Bilohur, Roman Oleksenko, Valentyna Voronkova, and Iryna Verkhovod. “Clasterization Tendences of Ukraine’s Tourism Sphere and Way Out of the COVID-19 Pandemic Crisis”. Journal of the University of Zulia 12, no. 34 (August 30, 2021): 60-75. Accessed May 20, 2024. https://www.produccioncientificaluz.org/index.php/rluz/article/view/36638.