T. Sorokman, N. Chernei, S. Sokolnyk, I. Sokolnyk, and N. Popelyuk, “The influence of Helicobacter pylori on the level of endotheline-1 and nitrogen oxide in the blood of children with the duodenal ulcer”, J Educ Health Sport, vol. 10, no. 11, pp. 261–272, Nov. 2020.