@misc{indiciae7197ac25f30e,
  title = {Fixed-ratio punishment.},
  author = {N H AZRIN and W C HOLZ and D F HAKE},
  year = {1963},
  doi = {10.1901/jeab.1963.6-141},
  url = {https://pubmed.ncbi.nlm.nih.gov/13965779/},
  note = {Source identifier: 13965779}
}