Hafez, M. H., Y. M. Abdelhamid, and A. I. Ahmed. “Comparison of Serum Cystatin C and Creatinine Based Methods in Detection of Early Renal Dysfunction in Critically Ill Patients”. African Journal of Nephrology, Vol. 14, no. 1, Jan. 2010, pp. 1-7, doi:10.21804/14-1-763.