TY  - RPRT
TI  - Drug discrimination under a concurrent fixed-interval fixed-interval schedule.
AU  - D E McMillan
AU  - M Li
AU  - W C Hardwick
PY  - 1997
DO  - 10.1901/jeab.1997.68-193
UR  - https://pubmed.ncbi.nlm.nih.gov/9335138/
ID  - 9335138
ER  -