Poudel, B., A. Mittal, B. K. Yadav, P. Sharma, B. Jha, and K. B. Raut. “Estimation and Comparison of Serum Levels of Sodium, Potassium, Calcium and Phosphorus in Different Stages of Chronic Kidney Disease”. Nepal Journal of Epidemiology, vol. 1, no. 5, Dec. 2011, pp. 160-7, doi:10.3126/nje.v1i5.6154.