@misc{indiciaedfbd26adadec,
  title = {Preference for mixed- versus fixed-ratio schedules.},
  author = {E Fantino},
  year = {1967},
  doi = {10.1901/jeab.1967.10-35},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811303/},
  note = {Source identifier: 16811303}
}