Muhammad Rehman Gulzar, Umer Farooq, Salman Azeem, and Ahmad Azeem. “CLINICAL STUDY FOR THE OBSERVATION OF EPIDEMIOLOGICAL TRENDS IN PEPTIC ULCER PERFORATION”. Journal of University Medical & Dental College, Vol. 10, no. 1, Mar. 2019, pp. 52-57, https://www.jumdc.com/index.php/jumdc/article/view/30.