@misc{indiciaefab065c409cd,
  title = {Variable-interval schedule performance in open and closed economies.},
  author = {G A Hall and K A Lattal},
  year = {1990},
  doi = {10.1901/jeab.1990.54-13},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812613/},
  note = {Source identifier: 16812613}
}