@misc{indiciaee0664d650121,
  title = {Satellite confirmation of settlement size coefficient},
  author = {Waldo R. Tobler},
  year = {1968},
  doi = {10.3133/ofr69285},
  url = {https://pubs.usgs.gov/publication/ofr69285},
  note = {Source identifier: ofr69285}
}