@misc{indiciaeb69d5fab98ff,
  title = {Negative reinforcement as shock-frequency reduction.},
  author = {R J Herrnstein and P N Hineline},
  year = {1966},
  doi = {10.1901/jeab.1966.9-421},
  url = {https://pubmed.ncbi.nlm.nih.gov/5961510/},
  note = {Source identifier: 5961510}
}