@misc{indiciae25c0e9a1d16b,
  title = {Variable interval responding maintained by intravenous codeine and ethanol injections in the rhesus monkey.},
  author = {J M Carney and M E Llewellyn and J H Woods},
  year = {1976},
  doi = {10.1016/0091-3057(76)90272-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/828270/},
  note = {Source identifier: 828270}
}