Problems of pricing in the field of maintenance and operation of urban areas and the ways to solve them on the example of the Sochi cityAleksandr Sekisov, Marina Kovtunenko, Irina Fokina, Ishkhan Zakaryan and Sergei PastukhovE3S Web Conf., 281 (2021) 08015DOI: https://doi.org/10.1051/e3sconf/202128108015