@misc{indiciaef90d60301f5f,
  title = {Category discrimination by pigeons using five polymorphous features.},
  author = {L Von Fersen and S E Lea},
  year = {1990},
  doi = {10.1901/jeab.1990.54-69},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812617/},
  note = {Source identifier: 16812617}
}