@misc{indiciae5bf86d5a4f5a,
  title = {Second-order conditioning with and without unconditioned stimulus presentation.},
  author = {P C Holland},
  year = {1980},
  doi = {10.1037//0097-7403.6.3.238},
  url = {https://pubmed.ncbi.nlm.nih.gov/7391751/},
  note = {Source identifier: 7391751}
}