@misc{indiciaed06ded2cbed0,
  title = {Preference between variable-ratio and fixed-ratio schedules: local and extended relations.},
  author = {D P Field and F Tonneau and W Ahearn and P N Hineline},
  year = {1996},
  doi = {10.1901/jeab.1996.66-283},
  url = {https://pubmed.ncbi.nlm.nih.gov/8921612/},
  note = {Source identifier: 8921612}
}