@misc{indiciae0c1093fd8583,
  title = {Urban population density: a comment.},
  author = {J Andrulis},
  year = {1981},
  doi = {10.1068/a130239},
  url = {https://pubmed.ncbi.nlm.nih.gov/12338215/},
  note = {Source identifier: 12338215}
}