@misc{indiciaebd5f02fa616f,
  title = {Molecular contingencies: reinforcement probability.},
  author = {J M Hale and C P Shimp},
  year = {1975},
  doi = {10.1901/jeab.1975.24-315},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811883/},
  note = {Source identifier: 16811883}
}