TY  - RPRT
TI  - Concurrent variable-interval schedule performance: Fixed versus mixed reinforcer durations.
AU  - M Davison
AU  - I Hogsden
PY  - 1984
DO  - 10.1901/jeab.1984.41-169
UR  - https://pubmed.ncbi.nlm.nih.gov/16812365/
ID  - 16812365
ER  -