Liesnyi , V., . V. Filonenko, and A. . Liesna. “Peculiarities of Diagnostics of Atypical Course of Perforated Duodenal Ulcer (clinical Case)”. Medicni Perspektivi, vol. 27, no. 2, June 2022, pp. 184-8, doi:10.26641/2307-0404.2022.2.260411.