@misc{indiciae16631bf033bf,
  title = {Probabilistically reinforced choice behavior in pigeons.},
  author = {C P Shimp},
  year = {1966},
  doi = {10.1901/jeab.1966.9-443},
  url = {https://pubmed.ncbi.nlm.nih.gov/5961513/},
  note = {Source identifier: 5961513}
}