Gupta, A., P. Saxena, U. Narain, S. Pandey, P. Gupta, and A. Gupta. “Renal Resistivity Index Is Inversely Proportional to Estimated Glomerular Filtration Rate in Chronic Kidney Disease”. International Journal of Advances in Medicine, vol. 5, no. 4, July 2018, pp. 950-3, doi:10.18203/2349-3933.ijam20183126.