@misc{indiciaecb3ad05e1506,
  title = {Conservation, choice, and the concurrent fixed-ratio schedule.},
  author = {N Shapiro and J Allison},
  year = {1978},
  doi = {10.1901/jeab.1978.29-211},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812049/},
  note = {Source identifier: 16812049}
}