Denisov, M.S., and Ya.A. Beloglazova. “ Аnticoronaviral Activity of Triterpenoids”. Biomedical Chemistry: Research and Methods 3, no. 2 (June 30, 2020): e00127. Accessed June 14, 2021. http://bmc-rm.org/index.php/bmcrm/article/view/127.