@misc{indiciae48a4848bcde8,
  title = {Chronic schizophrenics as behavioral engineers.},
  author = {A M Ludwig and A J Marx and P A Hill},
  year = {1971},
  doi = {10.1097/00005053-197101000-00005},
  url = {https://pubmed.ncbi.nlm.nih.gov/5548613/},
  note = {Source identifier: 5548613}
}