@misc{indiciaee5483750624d,
  title = {Conditional discrimination and equivalence relations: Control by negative stimuli.},
  author = {C Johnson and M Sidman},
  year = {1993},
  doi = {10.1901/jeab.1993.59-333},
  url = {https://pubmed.ncbi.nlm.nih.gov/16812689/},
  note = {Source identifier: 16812689}
}