FIHURA, Oksana, RUZHYLO, Sofiya, ŻUKOW, Xawery and POPOVYCH, Igor. Immediate effects of Ukrainian phytocomposition on biophotonics (GDV), EEG and HRV parameters. Journal of Education, Health and Sport. Online. 31 July 2021. Vol. 11, no. 7, pp. 349-365. [Accessed 24 December 2025]. DOI 10.12775/JEHS.2021.11.07.035.