Gorbunova, M.N., and G.F. Krainova. “TRITERPENE-CONTAINING POLYMER STRUCTURES: SYNTHESIS AND BIOLOGICAL ACTIVITY”. Perm Federal Research Centre Journal, no. 2, Sept. 2014, pp. 44-51, https://journal.permsc.ru/index.php/pscj/article/view/PSCJ2014n2p5.