1. Fearnley, G. R., Balmforth, G., and Fearnley, E., Clin. Sci., 16, 645 (1957).
2. Van Creveld, S., and Mochtar, I. A., Ann. Pœdiat., 194, 65 (1960).
3. Klein, E. M., in A Syllabus of Laboratory Examinations in Clinical Diagnosis: Critical Evaluation of Laboratory Procedures in the Study of the Patient, edit. by Page, L. B., and Culver, P. J., 65 (Harvard Univ. Press, Cambridge, Mass., 1960).