Dynamics of competitive interaction between two mining enterprises and one processing: existence and stability of the equilibrium pointAleksandr Kirjanen, Oleg Malafeyev, Irina Zaitseva, Aleksandr Kovshov and Dmitry KolesovE3S Web Conf., 193 (2020) 01051DOI: https://doi.org/10.1051/e3sconf/202019301051