@misc{indiciae3632d69165a6,
  title = {Stimulus functions in chained fixed-interval schedules.},
  author = {R T KELLEHER and W T FRY},
  year = {1962},
  doi = {10.1901/jeab.1962.5-167},
  url = {https://pubmed.ncbi.nlm.nih.gov/14454920/},
  note = {Source identifier: 14454920}
}