Awan, N. I., A. Jan, M. U. Rehman, and N. Ayaz. “The Effect of Ejection Fraction on Mortality in Coronary Artery Bypass Grafting (CABG) Patients”. Pakistan Journal of Medical Sciences, Vol. 36, no. 7, Oct. 2020, doi:10.12669/pjms.36.7.3266.