1. Gardner, D. L. (1960). Ann. rheum. Dis.. 19, 297.
2. Jackson, D. S. (1956a). Biochem. J., 62, 25P.
3. Jackson, D. S. (1956b). Ibid., 64, 8P. Jones, R. S., and Carter, Y. (1954). Arch. Path., 58, 613.
4. Jackson, D. S. (1957a). Ibid., 63, 472.
5. Jackson, D. S. (1957b). Ibid., 63, 484.