Uspensky, O. E., and P. I. Pustovoit. “Clinical Studies of Phytogel ‘Kvertulidon’ Stomatoprotective Action in Patients With Helicobacter Gastritis”. Journal of Education, Health and Sport, vol. 9, no. 7, July 2019, pp. 423-8, https://apcz.umk.pl/JEHS/article/view/7192.