Butt, A. M., Chaudhry, A. K., Mughal, M. A., ., T. N., Zafar, J. B., & ., K. R. (2011). FREQUENCY OF DUODENAL ULCER PERFORATION WITH RADIOLOGICAL EVIDENCE OF PNEUMOPERITONEUM. Pakistan Armed Forces Medical Journal, 61(2), 211–3. Retrieved from https://pafmj.org/PAFMJ/article/view/284