Spectroscopic and X-ray structural investigations of the active calcium preparationNargiza Sadikova, Nor Ulugmuradov, Zukhra Tursunova, Mavjuda Sagdullaeva and Nazokat KadirovaE3S Web of Conf., 401 (2023) 05079DOI: https://doi.org/10.1051/e3sconf/202340105079