Chemical composition and antioxidant activity of propolis, stored for more than 30 yearsIliana Nikolova, Ivaila Dincheva, Ira Taneva, Martina Pencheva, Darina Georgieva, Stanka Damyanova, Vanya Prodanova-Stefanova, Iliana Kostova and Albena StoyanovaBIO Web Conf., 122 (2024) 01021DOI: https://doi.org/10.1051/bioconf/202412201021