@misc{indiciaed84afdb0f77e,
  title = {[Differences between opiate, multi-drug and amphetamine abusers in voluntary treatment programs].},
  author = {J H Erikson and B Frykholm},
  year = {1977},
  url = {https://pubmed.ncbi.nlm.nih.gov/592921/},
  note = {Source identifier: 592921}
}