1. Araneo A., 1972. Cenni di analisi spettroscopica e cromatografica. In: Chimica analitica qualitativa, A. Araneo (Ed), 1st edition. Edizioni Piccin: Padova, 318–332.
2. Berry M.N., Mazzachi R.D., Peake M.J., 1991. Enzymatic spectrophotometric determination of Sodium and Potassium ions in serum or urine: a simple and satisfactory alternative to the use of Flame Photometry or Ion-selective electrodes. Clinical Chemistry, 37, 18–25.
3. Burnett D., Ayers G.J., Rumyen S.C., Woods T.F., 1988. Sodium measurements in the presence of paraproteins by four direct ISE methods and flame photometry compared. Annals of Clinical Biochemistry, 25, 102–109.
4. Coulter D.B. and Small L.L., 1972. Sodium and Potassium concentrations of erythrocytes from perinatal immature and adult dogs. Cornell Veterinarian, 63, 462–468.
5. Degen M.A., 1987. Pseudohyperkalemia in Akitas. Journal of American Veterinary Medical Association, 190, 541–543.