Vending technologies in improving food services Marina Belyaeva, Natalia Akimova, Alexander Sokolov, Dmitriy Ziborov, Stepan Burlankov and Artem Davydov E3S Web Conf., 413 (2023) 01002 Published online: 11 August 2023 DOI: 10.1051/e3sconf/202341301002