M. Al-Layla, A., and T. S. Al-Najafi. “Parathyroid Hormone and Some Biochemical Parameters Level in Sera of Renal Failure Patients Undergoing Hemodialysis”. Rafidain Journal of Science, vol. 17, no. 8, July 2006, pp. 17-28, doi:10.33899/rjs.2006.43463.