@misc{indiciaef16716cbf67e,
  title = {Improved method for morphine extraction from biological samples.},
  author = {G L Sprague and A E Takemori},
  year = {1979},
  doi = {10.1002/jps.2600680543},
  url = {https://pubmed.ncbi.nlm.nih.gov/430514/},
  note = {Source identifier: 430514}
}