Rana, D. R. L. “Lung Cancer in Relation to Smoking, Including Relighting Cigarette Butts: Kathmandu Valley: ‘An Unmatched Case Control Study’”. Journal of Health Research, vol. 31, no. Suppl. 2, Feb. 2018, pp. S171-178, https://he01.tci-thaijo.org/index.php/jhealthres/article/view/114537.