@misc{indiciae20abbf4fe186,
  title = {The structure of pigeon multiple-class same-different learning.},
  author = {Robert G Cook},
  year = {2002},
  doi = {10.1901/jeab.2002.78-345},
  url = {https://pubmed.ncbi.nlm.nih.gov/12507008/},
  note = {Source identifier: 12507008}
}