TY  - RPRT
TI  - Control theory and multiple placebo effects.
AU  - M P Jensen
AU  - P Karoly
DO  - 10.2190/cjjf-65m6-xllp-e4pc
UR  - https://pubmed.ncbi.nlm.nih.gov/4055251/
ID  - 4055251
ER  -