@misc{indiciae0eb3f61e3864,
  title = {Preference for mixed-interval versus fixed-interval schedules.},
  author = {M C Davison},
  year = {1969},
  doi = {10.1901/jeab.1969.12-247},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811349/},
  note = {Source identifier: 16811349}
}