@misc{indiciae57ba8b63e04c,
  title = {Preference after training with differential changeover delays.},
  author = {B Williams and M Bell},
  year = {1999},
  doi = {10.1901/jeab.1999.71-45},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812891/},
  note = {Source identifier: 16812891}
}