1. Adler, F. L.: Competition of antigens. Progr. Allergy8, 41 (1964).
2. Alexandre, G. P. J., J. E. Murray, G. J. Dammin, andB. Nolan: Immunosuppressive drug therapy in canine renal and skin homografts. Transplantation1, 432 (1963).
3. Altman, B.: Tissue transplantation: Circulating antibody in the homotransplantation of kidney and skin. Ann. roy. Coll. Surg. Engl.33, 79 (1963).
4. — andM. Simonsen: Cytotoxic antibody and hemagglutinin in canine homotransplantation. Ann. N.Y. Acad. Sci.120, 28 (1964).
5. Amos, D. B.: The use of simplified systems as an aid to the interpretation of mechanisms of graft rejection. Progr. Allergy6, 469 (1962).