@misc{indiciaebe3d73f1ec3e,
  title = {Visual discrimination learning as a function of shock-fear and task difficulty.},
  author = {J A HAMMES},
  year = {1956},
  doi = {10.1037/h0047018},
  url = {https://pubmed.ncbi.nlm.nih.gov/13376758/},
  note = {Source identifier: 13376758}
}