Bregantini D. Moment-based estimation of stochastic volatility. J Bank Financ. 2013 Dec 1;37(12):4755-64. doi: 10.1016/j.jbankfin.2013.08.008
Michels KB, Rothman KJ. Update on unethical use of placebos in randomised trials. Bioethics. 2003 Apr;17(2):188-204.