Kr Saha, B., D. Sarkar, L. Sarkar, and R. Bandyopadhyay. “Left Ventricular Dysfunction in Chronic Obstructive Pulmonary Disease”. International Journal of Medical Research and Review, Vol. 6, no. 7, Oct. 2018, pp. 385-90, doi:10.17511/ijmrr.2018.i07.08.