@misc{indiciae7b2b2b455914,
  title = {Opiate self-administration.},
  author = {Zheng-Xiong Xi and Elliot A Stein},
  year = {2003},
  doi = {10.1385/1-59259-379-8:251},
  url = {https://pubmed.ncbi.nlm.nih.gov/12703330/},
  note = {Source identifier: 12703330}
}