TY  - RPRT
TI  - Interresponse-time sensitivity during discrete-trial and free-operant concurrent variable-interval schedules.
AU  - J M Cleaveland
PY  - 1999
DO  - 10.1901/jeab.1999.72-317
UR  - https://pubmed.ncbi.nlm.nih.gov/10605102/
ID  - 10605102
ER  -