Joshi, R. D., S. Khadka, D. M. Joshi, A. Kadel, G. Dangal, and Y. Dongol. “Prevalence of Helicobacter Pylori Infection in Patients With Peptic Ulcer Disease at Kathmandu Model Hospital”. Journal of Chitwan Medical College, vol. 8, no. 4, Dec. 2018, pp. 3-7, https://nepjol.info/index.php/JCMC/article/view/23761.