Mohiuddin, M., A. W. Chowdhury, K. N. Islam, M. G. Amin, A. T. M. Mahfuzul Hoque, C. Saha, A. F. Kader, and A. Haque. “Echocardiographic Evaluation of Cardiac Status in Patients With Chronic Obstructive Pulmonary Disease”. Bangladesh Medical Research Council Bulletin, vol. 46, no. 3, Mar. 2021, pp. 204-10, doi:10.3329/bmrcb.v46i3.52256.