@misc{indiciae46127a0cc05b,
  title = {Two-key concurrent paced variable-interval paced variable-interval schedules of reinforcement.},
  author = {M Moffitt and C P Shimp},
  year = {1971},
  doi = {10.1901/jeab.1971.16-39},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811533/},
  note = {Source identifier: 16811533}
}