TY  - RPRT
TI  - Observing behavior during interval schedules.
AU  - D P Hendry
AU  - P V Dillow
PY  - 1966
DO  - 10.1901/jeab.1966.9-337
UR  - https://pubmed.ncbi.nlm.nih.gov/5961503/
ID  - 5961503
ER  -