Methotrexate and cyclosporine compared with cyclosporine alone for prophylaxis of acute graft versus host disease after marrow transplantation for leukemia. - Storb,R.; Deeg,H.J.; Whitehead,J.; Appelbaum,F.; Beatty,P.; Bensinger,W.; Buckner,C.D.; Clift,R.; Doney,K.; Farewell,V. (N Engl J Med, 1986)