TY  - RPRT
TI  - Drug discrimination in rats under concurrent variable-interval variable-interval schedules.
AU  - D E McMillan
AU  - W C Hardwick
PY  - 2000
DO  - 10.1901/jeab.2000.73-103
UR  - https://pubmed.ncbi.nlm.nih.gov/10682343/
ID  - 10682343
ER  -