Michels KB, Rothman KJ. Update on unethical use of placebos in randomised trials. Bioethics. 2003 Apr;17(2):188-204.
Westfall PH, Prillaman B, Ho SY. Properties of multiple intersection-union tests for multiple endpoints in combination therapy trials. J Biopharm Stat. 2001;11(3):125-38. doi: 10.1081/BIP-100107653