Soltani, El-Khamsa, et al. “Polyphenol Contents and Antioxidant Activity of Ethanolic and Aqueous Algerian Propolis Extracts (Region of Serdj El Ghoul)”. Journal of Drug Delivery and Therapeutics, vol. 10, no. 1, Jan. 2020, pp. 1-4, https://doi.org/10.22270/jddt.v10i1.3797.