@misc{indiciae61d9b8a6f533,
  title = {Concurrent ratio schedules: Fixed vs. variable response requirements.},
  author = {D P Rider},
  year = {1979},
  doi = {10.1901/jeab.1979.31-225},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812127/},
  note = {Source identifier: 16812127}
}