@misc{indiciae526c92ce5e8b,
  title = {Endogenous opiates: 1989.},
  author = {G A Olson and R D Olson and A J Kastin},
  doi = {10.1016/0196-9781(90)90163-y},
  url = {https://pubmed.ncbi.nlm.nih.gov/2087442/},
  note = {Source identifier: 2087442}
}