Kotvitskaya, A. A., and V. P. Khodakovskaya. “Clinical and Economic Analysis of Pharmacotherapy for Patients With Ulcer in the Terms of Prepaid Funds”. Farmatsevtychnyi Zhurnal, no. 5, Sept. 2018, pp. 23-29, https://pharmj.org.ua/index.php/journal/article/view/178.