@misc{indiciae31826a11fd8a,
  title = {Endogenous opiates: 1987.},
  author = {G A Olson and R D Olson and A J Kastin},
  doi = {10.1016/0196-9781(89)90098-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/2664726/},
  note = {Source identifier: 2664726}
}