Ivshina, I.B., E.V. Tarasova, I.A. Tolmacheva, and V.V. Grishko. 2017. “CHEMICAL AND ENZYMATIC SYNTHESIS OF BIOLOGICALLY ACTIVE COMPOUNDS BASED ON BETULIN”. Perm Federal Research Centre Journal, no. 2 (September): 46-53. https://journal.permsc.ru/index.php/pscj/article/view/PSCJ2017n2p6.