ONDREJOVIČ, M. ., D. . CHMELOVÁ, and T. . MALIAR. “Optimization of the Antioxidant Extraction from Eleutherococcus Senticosus Roots by Response Surface Methodology”. Nova Biotechnologica Et Chimica, vol. 12, no. 1, Sept. 2013, pp. 30–38, doi:10.2478/nbec-2013-0003.