@misc{indiciaefcc140d22de9,
  title = {Operant variability: evidence, functions, and theory.},
  author = {Allen Neuringer},
  year = {2002},
  doi = {10.3758/bf03196324},
  url = {https://pubmed.ncbi.nlm.nih.gov/12613672/},
  note = {Source identifier: 12613672}
}