@misc{indiciae4dab51ef4354,
  title = {Preference and resistance to change in concurrent variable-interval schedules.},
  author = {Matthew C Bell and Ben A Williams},
  year = {2002},
  doi = {10.3758/bf03192907},
  url = {https://pubmed.ncbi.nlm.nih.gov/12017966/},
  note = {Source identifier: 12017966}
}