@misc{indiciaefee765ef5f67,
  title = {Dose and physical dependence as factors in the self-administration of morphine by rats.},
  author = {J R Weeks and R J Collins},
  year = {1979},
  doi = {10.1007/bf00433045},
  url = {https://pubmed.ncbi.nlm.nih.gov/117486/},
  note = {Source identifier: 117486}
}