@misc{indiciae21df3d02c389,
  title = {Choice in a variable environment: every reinforcer counts.},
  author = {M Davison and W M Baum},
  year = {2000},
  doi = {10.1901/jeab.2000.74-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/10966094/},
  note = {Source identifier: 10966094}
}