@misc{indiciaea3eee8d73dac,
  title = {A digital sequential generator for implementing reinforcement schedules.},
  author = {C L Christman},
  year = {1974},
  doi = {10.1901/jeab.1974.22-577},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811822/},
  note = {Source identifier: 16811822}
}