@misc{indiciae9081c664af61,
  title = {Two-item same-different concept learning in pigeons.},
  author = {Aaron P Blaisdell and Robert G Cook},
  year = {2005},
  doi = {10.3758/bf03196051},
  url = {https://pubmed.ncbi.nlm.nih.gov/15971494/},
  note = {Source identifier: 15971494}
}