Gauchan, P., B. Lekhak, and J. Sherchand. “The Prevalence of Lower Respiratory Tract Infection in Adults Visiting Tribhuvan University Teaching Hospital”. Journal of Institute of Medicine Nepal, vol. 28, no. 2, Oct. 2007, pp. 10-14, https://www.nepjol.info/index.php/JIOM/article/view/591.