1. Doniach, D., Roitt, L. M., Walker, J. G., and Sherlock, S., Clin. exp. Immun., 1, 237–262 (1966).
2. Miller, J., Mitchell, C. G., Eddleston, A. L. W. F., Smith, M. G. M., Reed, W. D., and Williams, R., Lancet, ii, 296–297 (1972).
3. Hopf, U., Meyer zum Büschenfelde, K. H., and Freudenberg, J., Clin. exp. Immun. . 16, 117–123 (1974).
4. Rocklin, R., Mayers, O., and David, J., J. Immun., 104, 95–102 (1970).
5. Böyum, A., Scand. J. clin. lab. Invest., 21, supplement 97, 9–29 (1968).