Siddiqui, M. N. A., S. Sultana, M. Khan, and P. Basak. “Factors Associated With Hospital Admission in Patients With Acute Exacerbation of Chronic Obstructive Pulmonary Disease in a Teaching Hospital”. TAJ: Journal of Teachers Association, vol. 28, no. 2, Dec. 2018, pp. 52-57, doi:10.3329/taj.v28i2.39079.