TY  - RPRT
TI  - Effects of drugs on concurrent variable-interval variable-interval schedule performance.
AU  - D E McMillan
AU  - M Li
AU  - S H Snodgrass
PY  - 1998
DO  - 10.1097/00008877-199812000-00002
UR  - https://pubmed.ncbi.nlm.nih.gov/9890256/
ID  - 9890256
ER  -