@misc{indiciae95b28286bf4e,
  title = {Tolerance development to butorphanol: comparison with morphine.},
  author = {Y Z Feng and Y T Tseng and S P Jaw and B Hoskins and I K Ho},
  year = {1994},
  doi = {10.1016/0091-3057(94)90083-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/7862720/},
  note = {Source identifier: 7862720}
}