Upgrading utility infrastructure systems in the Russian Federation: Concession mechanismsYulia Vladimirovna Larionova, Pavel Vladimirovich Kachanov, Sofia Vladimirovna Kachanova, Natallia Viktarauna Krytskaya and Yulia Alexandrovna LaamartiE3S Web Conf., 535 (2024) 03010DOI: https://doi.org/10.1051/e3sconf/202453503010