Physico-chemical properties of calendula flower extract in bitter almond oil elemental composition and microbiological purityO.J. Khamidov, H.M. Vapayev, S.I. Nazarov, Sh. Boltaeva and B.Sh. GaniyevE3S Web of Conf., 389 (2023) 03008DOI: https://doi.org/10.1051/e3sconf/202338903008