Main problems of the development of fruit and berry raw materials processing industry in the Russian FederationNatalya Gribova, Lydia Berketova, Vitaly Perov, Lyudmila Lipatova and Natalya SoltaevaE3S Web Conf., 210 (2020) 03003DOI: https://doi.org/10.1051/e3sconf/202021003003