@misc{indiciaebe87fc9d905f,
  title = {d-Amphetamine, operant history, and variable-interval performance.},
  author = {A Poling and K Krafft and L Chapman},
  year = {1980},
  doi = {10.1016/0091-3057(80)90189-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/7393953/},
  note = {Source identifier: 7393953}
}