@misc{indiciae612ea0944d46,
  title = {Propoxyphene dependence: an update.},
  author = {G B Collins and K S Kiefer},
  year = {1981},
  doi = {10.1080/00325481.1981.11715930},
  url = {https://pubmed.ncbi.nlm.nih.gov/7312731/},
  note = {Source identifier: 7312731}
}