1. Calne, R. Y., Brit. Med. J., 4, 645 (1967).
2. White, E., and Hildemann, W., Second Intern. Cong. Transplant Soc. (1968).
3. Stuart, F., Surgery, 64, 17 (1968).
4. Feldman, J., and Sun Lee, J. Exp. Med., 126, 783 (1967).
5. Shiel, A. G. R. Advances in Transplantation, 599 (Munksgaard, 1968).