@misc{indiciaeffa7447da35d,
  title = {Endogenous opiates: 1991.},
  author = {G A Olson and R D Olson and A J Kastin},
  doi = {10.1016/0196-9781(92)90036-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/1494504/},
  note = {Source identifier: 1494504}
}