@misc{indiciae8b780c0aca3c,
  title = {Design of a spatial data structure using the relational normal forms},
  author = {Jan W. van Roessel},
  year = {1987},
  doi = {10.1080/02693798708927791},
  url = {https://pubs.usgs.gov/publication/70140568},
  note = {Source identifier: 70140568}
}