@misc{indiciaeb4af0a47bb4f,
  title = {A new rotating gradient disk: brightness, flicker, and brightness aftereffects.},
  author = {J T Walker},
  year = {1974},
  doi = {10.1016/0042-6989(74)90084-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/4818693/},
  note = {Source identifier: 4818693}
}