@misc{indiciaede7755e52299,
  title = {Unity and variety in visual form.},
  author = {E Leeuwenberg and P van der Helm},
  year = {1991},
  doi = {10.1068/p200595},
  url = {https://pubmed.ncbi.nlm.nih.gov/1806903/},
  note = {Source identifier: 1806903}
}