TY  - RPRT
TI  - Endogenous opioid systems in brain.
AU  - G W Pasternak
PY  - 1980
DO  - 10.1016/0002-9343(80)90347-2
UR  - https://pubmed.ncbi.nlm.nih.gov/6243856/
ID  - 6243856
ER  -