Pisanniy, O., and V. Shevchenko. “25-YEAR EXPERIENCE OF USING INTRAGASTRIC THERAPY TO TREAT DUODENAL ULCERS”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 7, 1, pp. 56-59, https://periodicals.karazin.ua/medicine/article/view/7250.