@misc{indiciae030d265d9e99,
  title = {Estimating map distances.},
  author = {N Ellis},
  year = {1994},
  doi = {10.1016/0168-9525(94)90204-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/8029826/},
  note = {Source identifier: 8029826}
}