References
- Clark E. P., Collip J. B. A study of the Tisdall method for the determination of blood serum calcium with a suggested modification. J. Biol. Chem. 1925; 63: 461
- Eldjarn L., Nygaard O., Sveinsson S. L. The determination of serum calcium. Scandinav. J. Clin. & Lab. Investigation 1955; 7: 92
- Lehmann J. A photoelectric micro method for the direct titration of calcium in serum with ethylenediamine tetracetate. Scandinav. J. Clin. & Lab. Investigation 1953; 5: 203