@misc{indiciae276cfd718e73,
  title = {A progression for generating variable-interval schedules.},
  author = {M FLESHLER and H S HOFFMAN},
  year = {1962},
  doi = {10.1901/jeab.1962.5-529},
  url = {https://pubmed.ncbi.nlm.nih.gov/13945507/},
  note = {Source identifier: 13945507}
}