@misc{indiciae724b79e13671,
  title = {Successive two-item same-different discrimination and concept learning by pigeons.},
  author = {Robert G. Cook and Debbie M. Kelly and Jeffrey S. Katz},
  year = {2003},
  doi = {10.1016/s0376-6357(03)00022-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/12729974/},
  note = {Source identifier: 12729974}
}