@misc{indiciae7553b8513448,
  title = {Spatial brightness changes in Koffka's ring.},
  author = {W R Mackavey},
  year = {1969},
  doi = {10.1037/h0028346},
  url = {https://pubmed.ncbi.nlm.nih.gov/5378222/},
  note = {Source identifier: 5378222}
}