@misc{indiciae9c8ca0f28511,
  title = {Fixed-ratio escape reinforcement.},
  author = {N H AZRIN and W C HOLZ and D F HAKE and T AYLLON},
  year = {1963},
  doi = {10.1901/jeab.1963.6-449},
  url = {https://pubmed.ncbi.nlm.nih.gov/13965780/},
  note = {Source identifier: 13965780}
}