@misc{indiciaedbc0fb6ed2c9,
  title = {Pigeon same-different concept learning with multiple stimulus classes.},
  author = {R G Cook and J S Katz and B R Cavoto},
  year = {1997},
  doi = {10.1037//0097-7403.23.4.417},
  url = {https://pubmed.ncbi.nlm.nih.gov/9411018/},
  note = {Source identifier: 9411018}
}