1. Bird G, Friend, PJ, Donaldson P, O'Grady J, Portmann B, Calne R, Williams R . Hyperacute rejection of the liver. Transplant Proc 1989;21:3742–4.
2. Penn I, Hammond W, Brettschneider L, Starzl TE . Malignant lymphomas in transplant patients. Transplant Proc 1969;1:106–12.
3. Keast D . Immunosurveillance and cancer. Lancet 1970;2:710–2.
4. Opelz G . Comparison of immunosuppressive protocols in renal transplantation: a multicentre view. Transplant Proc 1988;20:31–6.
5. Calne RY, Sells RA, Pena JR, Davis DR, Millar PR, Herbertson BM, et al. Induction of immunological tolerance by porcine liver allografts. Nature 1969;223:472–6.