Riaz, B., M. Khan, H. Ali, and S. Majeed. “CORRELATION OF SIGNAL AVERAGED ECG PARAMETERS WITH LEFT VENTRICULAR MASS INDEX IN PATIENTS WITH SYSTEMIC ARTERIAL HYPERTENSION”. Pakistan Journal of Physiology, Vol. 14, no. 1, Mar. 2018, pp. 19-22, http://pjp.pps.org.pk/index.php/PJP/article/view/155.