TY  - RPRT
TI  - Concurrent fixed-interval variable-ratio schedules and the matching relation.
AU  - D P Rider
PY  - 1981
DO  - 10.1901/jeab.1981.36-317
UR  - https://pubmed.ncbi.nlm.nih.gov/16812250/
ID  - 16812250
ER  -