@misc{indiciaeacfbfec7131b,
  title = {Drug discrimination under a concurrent fixed-interval fixed-interval schedule.},
  author = {D E McMillan and M Li and W C Hardwick},
  year = {1997},
  doi = {10.1901/jeab.1997.68-193},
  url = {https://pubmed.ncbi.nlm.nih.gov/9335138/},
  note = {Source identifier: 9335138}
}