TY  - RPRT
TI  - d-Amphetamine, operant history, and variable-interval performance.
AU  - A Poling
AU  - K Krafft
AU  - L Chapman
PY  - 1980
DO  - 10.1016/0091-3057(80)90189-6
UR  - https://pubmed.ncbi.nlm.nih.gov/7393953/
ID  - 7393953
ER  -