Yashin, A.Y. 2020. Determination theaflavins in black teas of the different countries by HPLC method with amperometric detector. Sorbtsionnye i Khromatograficheskie Protsessy. 20, 2 (May 2020), 158-165. DOI:https://doi.org/10.17308/sorpchrom.2020.20/2770.