@misc{indiciae0f52728d3eac,
  title = {Punishment contras during free-operant avoidance.},
  author = {K A Lattal and M A Griffin},
  year = {1972},
  doi = {10.1901/jeab.1972.18-509},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811640/},
  note = {Source identifier: 16811640}
}