TY  - RPRT
TI  - Response-rate differences in variable-interval and variable-ratio schedules: An old problem revisited.
AU  - M R Cole
PY  - 1994
DO  - 10.1901/jeab.1994.61-441
UR  - https://pubmed.ncbi.nlm.nih.gov/16812732/
ID  - 16812732
ER  -