@misc{indiciae3ed3f5f6bd66,
  title = {Factors affecting voluntary morphine intake in self-maintained addicted rats.},
  author = {J R Weeks and R J Collins},
  year = {1964},
  doi = {10.1007/bf00413156},
  url = {https://pubmed.ncbi.nlm.nih.gov/5890552/},
  note = {Source identifier: 5890552}
}