1. Contribution to a history of the placebo effect;Shapiro;Behav Sci,1960
2. Effects of suggestion and conditioning on the action of chemical agents in human subjects—the pharmacology of placebos;Wolf;J Lab Clin Med,1950
3. Placebo effect on the rat;Herrenstein;Science,1962
4. An experimental analysis of the placebo effect;Pihl;J Clin Pharmacol,1971
5. The doctor-patient relationship;Bogdanoff;JAMA,1965