Sijapati, M., N. Bhatta, B. Khanal, M. Lamsal, and S. Chaudhary. “Study of Factors Determining Outcomes in the Hospitalized Patients With Acute Exacerbation of Chronic Obstructive Pulmonary Disease (COPD)”. Journal of Universal College of Medical Sciences, vol. 2, no. 2, Sept. 2014, pp. 28-34, doi:10.3126/jucms.v2i2.11171.