@misc{indiciaee5a5a6c58d95,
  title = {Observing behavior during interval schedules.},
  author = {D P Hendry and P V Dillow},
  year = {1966},
  doi = {10.1901/jeab.1966.9-337},
  url = {https://pubmed.ncbi.nlm.nih.gov/5961503/},
  note = {Source identifier: 5961503}
}