TY  - RPRT
TI  - Contrast effects in multiple fixed-interval reinforcement schedules.
AU  - N K Innis
PY  - 1978
DO  - 10.1901/jeab.1978.29-233
UR  - https://pubmed.ncbi.nlm.nih.gov/16812051/
ID  - 16812051
ER  -