TY  - RPRT
TI  - Metkephamid effects on operant behavior.
AU  - J D Leander
AU  - C R Wood
DO  - 10.1016/0196-9781(82)90013-4
UR  - https://pubmed.ncbi.nlm.nih.gov/7177922/
ID  - 7177922
ER  -