TY  - RPRT
TI  - A dose-response comparison between methadone and morphine self-administration.
AU  - T E Werner
AU  - S G Smith
AU  - W M Davis
PY  - 1976
DO  - 10.1007/bf00735825
UR  - https://pubmed.ncbi.nlm.nih.gov/944933/
ID  - 944933
ER  -