Sorokman Tаmila, CHERNEI, Nadiia, SOKOLNYK, Snizhana, SOKOLNYK, Iryna and POPELYUK, Nataliya. The influence of Helicobacter pylori on the level of endotheline-1 and nitrogen oxide in the blood of children with the duodenal ulcer. Journal of Education, Health and Sport. Online. 30 November 2020. Vol. 10, no. 11, pp. 261-272. [Accessed 9 April 2026]. DOI 10.12775/JEHS.2020.10.11.026.