The essence and basic product selling strategies in recreation and health tourismOleksandr Hladkyi, Svitlana Sakhno, Olena Khadzhynova, Alla Dakal and Larysa KapranovаE3S Web Conf., 255 (2021) 01033DOI: https://doi.org/10.1051/e3sconf/202125501033