@misc{indiciaefa2984b3f954,
  title = {Development of conditional and equivalence relations without differential consequences.},
  author = {R J Harrison and G Green},
  year = {1990},
  doi = {10.1901/jeab.1990.54-225},
  url = {https://pubmed.ncbi.nlm.nih.gov/2103583/},
  note = {Source identifier: 2103583}
}