Ahmed, I., A. A. Rahim, K. N. U. Mahmood, and M. Ahmad. “Early Evaluation of Renal Function in High-Risk Patients After Off-Pump Coronary Artery Bypass Grafting”. Cardiovascular Journal, vol. 9, no. 1, Sept. 2016, pp. 23-30, doi:10.3329/cardio.v9i1.29537.