@misc{indiciaee6e4815ef876,
  title = {Physiological changes associated with changing fixed ratio schedules in rats.},
  author = {M A Persinger and K P Ossenkopp and V Kamaya and J J Pear},
  year = {1974},
  doi = {10.2466/pr0.1974.35.2.847},
  url = {https://pubmed.ncbi.nlm.nih.gov/4438531/},
  note = {Source identifier: 4438531}
}