Ecology of the Сity and the Role of Tourism in the Formation of Living Space (on the Example of Urban Ecosystems of the Cities of Kryvyi Rih and Uman)Serhiy Sonko, Olena Lakomova, Daria Shiyan, Tetyana Karpenko and Yulia KosenkoSHS Web Conf., 100 (2021) 05008DOI: https://doi.org/10.1051/shsconf/202110005008