Liesnyi , V.V., V.O. Filonenko, and A.S. Liesna. 2022. “Peculiarities of Diagnostics of Atypical Course of Perforated Duodenal Ulcer (clinical Case)”. Medicni Perspektivi 27 (2):184-88. https://doi.org/10.26641/2307-0404.2022.2.260411.