Altalhi, Hanan G. K, and Asgad A Abdalgbar. “The Accuracy of the Electrocardiogram in Identifying Chronic Heart Failure Due to Left Ventricular Systolic Dysfunction”. Al-Mukhtar Journal of Sciences, vol. 28, no. 1, June 2013, pp. 39-45, doi:10.54172/mjsc.v28i1.143.