Adekenov, S. M., and G. A. Atazhanova. “Heteroatom-Containing Natural Sesquiterpene Lactones and Methods for Their Obtaining”. Eurasian Chemico-Technological Journal 15, no. 3 (July 25, 2013): 195–208. Accessed May 3, 2024. https://ect-journal.kz/index.php/ectj/article/view/339.