TY  - RPRT
TI  - Conditioning in human opiate addicts.
AU  - C P O'Brien
AU  - T Testa
AU  - T J O'Brien
AU  - R Greenstein
DO  - 10.1007/bf03000314
UR  - https://pubmed.ncbi.nlm.nih.gov/995439/
ID  - 995439
ER  -