@misc{indiciae56c1dc4ea41e,
  title = {Choice and reinforcement delay.},
  author = {G D Gentry and M J Marr},
  year = {1980},
  doi = {10.1901/jeab.1980.33-27},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812159/},
  note = {Source identifier: 16812159}
}