@misc{indiciae9dc308e10660,
  title = {A complex concurrent schedule of reinforcement.},
  author = {C B Ferster},
  year = {1959},
  doi = {10.1901/jeab.1959.2-65},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811241/},
  note = {Source identifier: 16811241}
}