N. Yanchev, N. Petkova, I. Ivanov, and D. Delev, “Total Polyphenolic Content and Antioxidant Activity of Different Extracts from Sideritis scardica: doi.org/10.26538/tjnpr/v6i7.12”, TJNPR, vol. 6, no. 7, pp. 1113–1118, Jul. 2022.