1. Tammelin, L. E., and Morgensen, S., Acta Chem. Scand., 6, 988 (1952).
2. Wootton, I. D. P., Clin. Chem., 3, No. 4, Pt. 2 Supp., 401 (1957).
3. Smith, R. G., Craig, P., Bird, E. J., Boyle, A. J., Iseri, L. T., Jacobson, S. D., and Myers, G. B., Amer. J. Clin. Path., 20, 263 (1950).
4. King, E. J., and Wootton, I. D. P., “Micro Analysis in Medical Biochemistry”, 3rd edit., 2 (Churchill, London).
5. Elliott, J. B., and Pearson, P. B., J. Lab. Clin. Med., 31, 1262 (1946).