Phenolic complex of red wine materials from grapes growing in the Crimea Dmitry Yermolin, Galina Yermolina, Yuriy Gerber, Daria Zadorozhnaya and Zinaida Kotolovets E3S Web Conf., 175 (2020) 08002 Published online: 29 June 2020 DOI: 10.1051/e3sconf/202017508002