Lock EF, Ziemiecki RM, Marron J, Dittmer DP. Efficiency clustering for low-density microarrays and its application to QPCR. BMC Bioinformatics. 2010 Jul;11(386).
Michels KB, Rothman KJ. Update on unethical use of placebos in randomised trials. Bioethics. 2003 Apr;17(2):188-204.