@misc{indiciae4c3a06a37ace,
  title = {Concurrent fixed-interval variable-ratio schedules and the matching relation.},
  author = {D P Rider},
  year = {1981},
  doi = {10.1901/jeab.1981.36-317},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812250/},
  note = {Source identifier: 16812250}
}