Aman, Z. (2008) “PATTERN OF CHANGE IN THE FREQUENCY OF HELICOBACTER PYLORI WITH PERFORATED DUODENAL ULCER”, Journal of Ayub Medical College Abbottabad, 20(4), pp. 41–43. Available at: https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/3840 (Accessed: 3 May 2025).