mran Ellahi Soomro, Qurban Ali Rahu, Khalid Naseeb. “Frequency of Left Ventricular Systolic Dysfunction in Patients With Unstable Angina”. Journal of Peoples University of Medical &Amp; Health Sciences Nawabshah. (JPUMHS), vol. 4, no. 4, Dec. 2014, pp. 223-8, http://publication.pumhs.edu.pk/index.php/ojs/article/view/164.