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
- Fales F. W. A micromethod for the determination of serum calcium. J. Biol. Chem. 1953; 204: 577
- Kramer B., Tisdall F. A simple technique for the determination of calcium and magnesium in small amounts of serum. J. Biol. Chem. 1921; 47: 475
- Lehmann J. A photoelectric micro method for the direct titration of calcium in serum with ethylenediamine tetra-acetate. Scandinav. J. Clin. & Lab. Investigation 1953; 5: 203