1. http://optn.transplant.hrsa.gov/converge/latestData/rptStrat.asp
2. http://optn.transplant.hrsa.gov/news/revised-national-kidney-transplant-allocation-system-is-now-in-place
3. The specific distribution of glycolipid-based blood group A antigens in human kidney related to A1/A2 Lewis, and secretor status of single indivdiuals. A possible molecular explanation for successful transplantation of A2 kidneys into O recipients;Breimer;Transplantation,1986
4. Successful transplantation of blood group A2 kidneys into non-A recipients;Nelson;Transplantation,1988
5. Blood group A and B antigen expression in human kidneys correlated to A1/A2/B, Lewis, and secretor status;Breimer;Transplantation,2006