Role of natural killer cell alloreactivity in HLA-mismatched hematopoietic stem cell transplantation. - Ruggeri,L.; Capanni,M.; Casucci,M.; Volpi,I.; Tosti,A.; Perruccio,K.; Urbani,E.; Negrin,R.; Martelli,M.; Velardi,A. (Blood, 1999)