@misc{indiciaec70e83802563,
  title = {Categorical shape and color coding by pigeons.},
  author = {T R Zentall and P Jackson-Smith and J A Jagielo and G B Nallan},
  year = {1986},
  url = {https://pubmed.ncbi.nlm.nih.gov/3701264/},
  note = {Source identifier: 3701264}
}