RUDENKO, A. I., MOSIYCHUCK, L. M., KHOMENKO, O. M. and PETISHKO, O. P. Interconnection between aggression and protection factors of gastric juice and oral liquid of the patients with precancerous changes of gastric mucosa. Journal of Education, Health and Sport. Online. 24 May 2019. Vol. 9, no. 5, pp. 564-574. [Accessed 10 January 2025].