@misc{indiciaef838bf1a610a,
  title = {Response-rate differences in variable-interval and variable-ratio schedules: An old problem revisited.},
  author = {M R Cole},
  year = {1994},
  doi = {10.1901/jeab.1994.61-441},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812732/},
  note = {Source identifier: 16812732}
}