@misc{indiciae4bfc7344547c,
  title = {A comparison of responding maintained under second-order schedules of intramuscular cocaine injection or food presentation in squirrel monkeys.},
  author = {J L Katz},
  year = {1979},
  doi = {10.1901/jeab.1979.32-419},
  url = {https://pubmed.ncbi.nlm.nih.gov/117071/},
  note = {Source identifier: 117071}
}