1. Billing, B. H. (1954). Biochem. J., 56, xxx.
2. Billing, B. H. (1955). Journal of Clinical Pathology, 8, 126.
3. Cole, P. G., Lathe, G. H., andBilling, B. H. (1954). Biochem. J., 57, 514.
4. Weinbren, K. (1953). Brit. J. exp. Path., 34, 280.
5. Unpublished observations;Weinbren, K.; Billing, B.H.,1954