1. Adam, M., Malecek, J., and KCtovA, M. (1957). Ann. rheum. Dis., 16, 69.
2. Bottiger, L. E., and Carlson, L. A. (1960). Clin. chim. Acta, 5, 664.
3. Bottiger, L. E., and Carlson, L. A., Estbom, B., and Mollerberg, H. (1960). Acta Soc. Med. upsalien., 65, 72.
4. Malmquist, E., and Olhagen, B. (1964). Ann. rheum. Dis., 23,489.
5. Gamp, A. (1962). Z. Rheumaforsch., 21, 128.