Gyawali, Achyut, et al. “Plasma Fibrinogen Level in Chronic Obstructive Pulmonary Disease and Its Correlation With GOLD Severity Staging”. Journal of Institute of Medicine Nepal, vol. 43, no. 1, Apr. 2021, pp. 1-4, https://www.nepjol.info/index.php/JIOM/article/view/37460.