@misc{indiciaea04384ccba90,
  title = {Amphetamine self-administration by humans: modulation by contingencies associated with task performance.},
  author = {S D Comer and M Haney and R W Foltin and M W Fischman},
  year = {1996},
  doi = {10.1007/bf02805973},
  url = {https://pubmed.ncbi.nlm.nih.gov/8880942/},
  note = {Source identifier: 8880942}
}