1. Martinek, R. G.: Review of methods for determining urea nitrogen in biologic fluids.J. Am. Med. Technol., 31, 678 (1969).
2. Murdaugh, V., Jr., Doyle, E.M.: Effect of hemoglobin on erythrocyte urea concentration.J. Lab. Clin. Med., 57, 759 (1961).
3. Katz, M. A., Hull, A. R.: Transcellular creatinine disequilibrium and its significance in hemodialysis.Nephron, 12, 171 (1974).
4. Nolph, K. D., Bass, O. E., Maher, J. F.: Acute effects of hemodialysis on removal of intracellular solutes.Trans. Am. Soc. Artif. Intern. Organs, 20, 622 (1974).
5. Grossman, D. F., Kopp, K. F.: Kinetics of urea diffusion in the organism during hemodialysis. A quantitative control of elimination of urea.Proc. Europ. Dialysis Transplant. Ass., 3, 290 (1966).