@misc{indiciae7d09e08a5acd,
  title = {The frequency of seeing square wave density modulations in random dot patterns.},
  author = {A M Lelkens and P M Oppeneer},
  year = {1983},
  doi = {10.1007/bf00318084},
  url = {https://pubmed.ncbi.nlm.nih.gov/6639980/},
  note = {Source identifier: 6639980}
}