AMAN, Zahid; AFRIDI, Viqar; KHAN, Jehangir. Prevalnce of Helicobacter Pylori in Perforated Peptic ulcer. Journal of Postgraduate Medical Institute, [S. l.], v. 16, n. 2, 2011. Disponível em: https://www.jpmi.org.pk/index.php/jpmi/article/view/783. Acesso em: 9 oct. 2025.