Umer, Said, Usman Ismat Butt, Asad Ali Toor, Zeeshan Razzaq, Muhammad Waris Farooka, Shazia Noreen, Abeeda Butt, and Henry Paul Redmond. 2018. “GALLSTONE ILEUS WITH CHOLECYSTO-DUODENAL FISTULA IN AN ELDERLY MALE”. Journal of Ayub Medical College Abbottabad 30 (4):610-12. https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/1327.