@misc{indiciaef2f6ba0a8864,
  title = {Matching to reinforcer value: human concurrent variable-interval performance.},
  author = {M J Cliffe and S J Parry},
  year = {1980},
  doi = {10.1080/14640748008401845},
  url = {https://pubmed.ncbi.nlm.nih.gov/7443972/},
  note = {Source identifier: 7443972}
}