TY  - RPRT
TI  - Response rate and changeover performance on concurrent variable-interval schedules.
AU  - I W Hunter
AU  - M C Davison
PY  - 1978
DO  - 10.1901/jeab.1978.29-535
UR  - https://pubmed.ncbi.nlm.nih.gov/16812076/
ID  - 16812076
ER  -