@misc{indiciae5ae84e9d6805,
  title = {An inexpensive token.},
  author = {I G Osborne},
  year = {1969},
  doi = {10.1901/jaba.1969.2-100},
  url = {https://pubmed.ncbi.nlm.nih.gov/16795205/},
  note = {Source identifier: 16795205}
}