Ohl F, Jung M, Xu C, Stephan C, Rabien A, Burkhardt M, Nitsche A, Kristiansen G, Loening SA, Radonić A, Jung K. Gene expression studies in prostate cancer tissue: which reference gene should be selected for normalization? Journal of Molecular Medicine. 2005 Oct 07;83(12):1014–24. doi: 10.1007/s00109-005-0703-z.