L. Shrestha, N. B. Mahotra, B. S. J. B. Rana, D. Banstola, T. M. Amatya, and B. Mahat, “Spirometryin Smokers and Non-smokers: A Comparative Study”, Journal of Karnali Academy of Health Sciences, vol. 2, no. 3, pp. 234–238, Dec. 2019, doi: 10.3126/jkahs.v2i3.26661.