Ahmed, H., J. I. Farooqi, Q. Ikramullah, F. Ahmad, M. Nawaz, S. Gul, and M. ur Rehman. “FREQUENCY OF UPPER GASTROINTESTINAL PATHOLOGIES: LOCAL PERSPECTIVE”. Journal of Postgraduate Medical Institute, vol. 20, no. 3, Aug. 2011, https://www.jpmi.org.pk/index.php/jpmi/article/view/114.