Umer, S.; Butt, U. I.; Toor, A. A.; Razzaq, Z.; Farooka, M. W.; Noreen, S.; Butt, A.; Redmond, H. P. GALLSTONE ILEUS WITH CHOLECYSTO-DUODENAL FISTULA IN AN ELDERLY MALE. J Ayub Med Coll Abbottabad 2018, 30, 610-612.