@misc{indiciae86bc12afa201,
  title = {Discriminated punishment: avoidable and unavoidable shock.},
  author = {J Gibbon},
  year = {1967},
  doi = {10.1901/jeab.1967.10-451},
  url = {https://pubmed.ncbi.nlm.nih.gov/6050057/},
  note = {Source identifier: 6050057}
}