@misc{indiciae12967350a39b,
  title = {Schema discrimination without external reinforcement.},
  author = {E M Edmonds and M R Mueller},
  year = {1967},
  doi = {10.2466/pms.1967.24.2.436},
  url = {https://pubmed.ncbi.nlm.nih.gov/6040214/},
  note = {Source identifier: 6040214}
}